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Vulpini

Vulpini is a tribe of the subfamily Caninae within the family Canidae, consisting of the genera Vulpes (12 extant species, collectively known as the true foxes) and Urocyon (2 extant species, gray foxes). These small to medium-sized carnivorans, typically weighing 1–15 kg and measuring 30–110 cm in body length, are distinguished by their slender bodies, pointed muzzles, prominent erect ears, and bushy tails, which aid in communication and balance during agile pursuits. Adapted primarily as opportunistic omnivores and predators, true foxes exhibit remarkable versatility, preying on small mammals, birds, insects, and fruits while inhabiting diverse environments from Arctic tundras and temperate forests to arid deserts and grasslands across Eurasia, North America, Africa, and introduced populations in Australia.^[1]^[2] The tribe Vulpini represents a monophyletic clade that diverged from other canids around 10–12 million years ago during the late Miocene, evolving from primitive fox-like ancestors such as Leptocyon and radiating into specialized forms suited to varied ecological niches. Phylogenetic analyses confirm Vulpini as a cohesive group, with species like the widespread red fox (V. vulpes)—the largest and most adaptable—sharing synapomorphies including reduced dentition for a mesocarnivorous diet, enhanced auditory capabilities via enlarged auditory bullae, and behavioral traits such as cunning solitary hunting and denning. Unlike the dog-like tribe Canini, Vulpini species generally lack pack structures, favoring territorial individualism that enhances survival in fragmented habitats. Fossil records indicate an early North American origin, with subsequent dispersals to the Old World, underscoring their role in shaping modern canid diversity.^[3]^[4] Notable among Vulpini are adaptations reflecting environmental pressures: the Arctic fox (V. lagopus) boasts thick fur and seasonal pelage changes for polar extremes, while the fennec fox (V. zerda) features oversized ears for heat dissipation and hearing prey in sandy dunes; gray foxes (Urocyon spp.) are unique for their arboreal climbing abilities. Conservation concerns vary, with species like the swift fox (V. velox) recovering from near-extinction through reintroduction efforts, whereas others face threats from habitat loss and hybridization with introduced red foxes. Vulpini hold significant cultural symbolism worldwide, embodying traits like intelligence and adaptability in folklore, yet their ecological impact includes both pest control and occasional conflicts with agriculture.^[5]^[6]

Taxonomy and phylogeny

Classification within Canidae

Vulpini is classified as a tribe within the subfamily Caninae of the family Canidae, which belongs to the order Carnivora.^[7] This placement reflects the division of Caninae into two primary tribes: the fox-like Vulpini and its sister tribe Canini, comprising dog-like canids.^[8] The tribe Vulpini was originally described by Wilhelm Hemprich and Christian Gottfried Ehrenberg in 1832 to group fox-like canids distinct from wolves and dogs.^[9] Modern taxonomic recognition of Vulpini as a monophyletic clade is substantiated by integrated analyses of molecular sequences, karyological data, and morphological traits, confirming its evolutionary coherence among extant canids.^[8] Note that while some definitions restrict Vulpini to the genus Vulpes, current consensus includes additional genera. Classification relies on several key diagnostic features that distinguish Vulpini from other Caninae. Dentition is adapted for omnivory, featuring reduced carnassial teeth (P4 and m1) with shortened shearing blades and enlarged post-carnassial molars (M1–M2) for grinding.^[9] The basicranium exhibits inflated auditory bullae formed by the entotympanic bone, providing enhanced hearing sensitivity, alongside a broad paroccipital process closely appressed to the bulla and absence of frontal sinuses.^[9] Members of Vulpini are generally smaller-bodied than those of Canini, with more gracile skulls and mandibles suited to their ecological niches.^[9] Current consensus from taxonomic databases and recent phylogenetic studies recognizes Vulpini as containing three living genera and 15 species: Vulpes (12 species), Otocyon (1 species), and Nyctereutes (2 species).^[10]

Phylogenetic relationships

Vulpini constitutes the sister clade to Canini within the subfamily Caninae of Canidae, with molecular clock estimates placing their divergence at approximately 10–12 million years ago during the late Miocene. This split is supported by time-calibrated phylogenies derived from genomic and osteological data, highlighting a major evolutionary radiation in canids following continental colonizations into Eurasia and South America around 11 million years ago.^[11] Within Vulpini, Nyctereutes (raccoon dog) holds a basal position, reflecting its early divergence within the tribe, while Otocyon (bat-eared fox) represents an early branching lineage adapted to specialized ecological niches. Vulpes, the most diverse genus in Vulpini, forms a derived monophyletic clade, with internal diversification driven by global dispersals starting around 8.5 million years ago. These relationships are corroborated by 2024 phylogeographic analyses integrating fossil-calibrated molecular clocks, with no major changes reported as of 2025.^[12] The monophyly of Vulpini is robustly evidenced by mitogenome sequencing, as demonstrated in a 2024 study of the Cape fox (Vulpes chama), which achieved 100% bootstrap support for Vulpes and overall tribal coherence exceeding 90% in concatenated analyses. Complementary whole-genome investigations further affirm this structure, revealing high-confidence nodal supports and minimal mito-nuclear discordance within the clade.^[13] Urocyon (gray foxes) is distinctly excluded from Vulpini, instead occupying a basal position within Caninae as a separate lineage that diverged prior to the Vulpini–Canini split, based on chromosome-level genome assemblies and evolutionary radiation models from 2023. This placement underscores Urocyon's retention of ancestral traits, such as PRDM9 gene loss in the early canid radiation.^[11]

Physical characteristics

Morphology

Members of the Vulpini tribe exhibit a body size range of 1–15 kg, with elongated bodies, relatively short legs adapted for agile movement, and bushy tails that constitute 30–50% of total body length, aiding in balance and communication.^[14] These features contribute to their lithe, cursorial build, distinguishing them from bulkier canids in the Canini tribe.^[14] Cranially, Vulpini possess a pointed muzzle that enhances olfactory capabilities, large orbits providing enhanced binocular vision for crepuscular activity, and a dental formula typically of 3/3, 1/1, 4/4, 2/3 (totaling 42 teeth) in most species, supporting a varied omnivorous to carnivorous diet through shearing carnassials and grinding molars; however, Otocyon megalotis features additional post-carnassial molars, resulting in 46–50 teeth specialized for insectivory.^[14] The skull is generally narrow and dolichocephalic, with pronounced zygomatic arches for jaw muscle attachment.^[14] The pelage of Vulpini is dense and insulating, featuring a soft underfur and coarser guard hairs that provide camouflage via countershading—darker dorsal surfaces and lighter ventral areas—often in reddish-brown or gray tones suited to diverse environments.^[14] Variations occur, such as the enlarged ears of Otocyon megalotis (bat-eared fox), which feature extensive vascularization for heat dissipation in arid habitats.^[15] Sexual dimorphism in Vulpini is minimal, with males typically 10–20% larger in body mass and linear dimensions than females across most species, reflecting subtle differences in reproductive roles without extreme size disparities.^[14]

Adaptations

Vulpini exhibit a range of sensory adaptations that enhance their survival across varied habitats, with acute olfaction playing a central role in foraging and navigation. Members of the tribe possess relatively large olfactory bulbs compared to other canids, facilitating superior scent detection; for instance, studies on Vulpes species reveal a greater macroscopic development of the main olfactory bulb relative to brain size, underscoring their reliance on chemical cues for environmental awareness.^[16] Enhanced hearing is particularly pronounced in Otocyon megalotis, the bat-eared fox, whose oversized ears—measuring up to 13.5 cm in length—enable precise detection of low-frequency sounds produced by subterranean insects, a key prey resource in its savanna habitat.^[17] Thermoregulatory adaptations in Vulpini are tailored to extreme climatic conditions, from arid deserts to temperate winters. Desert-dwelling species like Vulpes zerda, the fennec fox, feature disproportionately large ears that promote radiative cooling by increasing surface area for heat dissipation; vascularized ear tissues facilitate non-evaporative heat loss, allowing the fox to maintain body temperature in environments exceeding 40°C without excessive water expenditure.^[18] In contrast, Nyctereutes procyonoides, the raccoon dog, employs seasonal hibernation as a physiological strategy to endure cold winters, entering a state of torpor from November to April where body temperature drops significantly, reducing metabolic demands during food scarcity.^[19] Locomotor adaptations emphasize agility and endurance suited to open terrains, with many Vulpini displaying a cursorial body plan characterized by elongated limbs and flexible spines. Vulpes species exemplify this through their capacity for swift, agile running, achieving speeds up to 48 km/h in short bursts to pursue prey or evade predators, supported by relatively long hindlimbs that enhance stride efficiency.^[20] While semi-arboreal traits are more developed in Urocyon, some Vulpini retain minor climbing abilities using strong limbs and sharp claws for gripping bark during brief ascents, though these are not primary locomotor features. Reproductive adaptations in Vulpini include mechanisms for optimizing offspring survival amid environmental variability. Certain Vulpes species, such as V. vulpes (red fox) and V. velox (swift fox), exhibit polymorphic delayed implantation, where blastocysts remain unattached in the uterus for variable periods—up to several weeks in some populations—enabling birth synchronization with seasonal resource peaks like spring prey abundance.^[21] This flexibility allows females to adjust gestation length (typically 49–58 days) based on nutritional status, enhancing litter viability without altering mating timing.

Behavior and ecology

Members of the Vulpini tribe exhibit diverse social organizations, ranging from solitary to group-living structures adapted to their ecological niches. In the genus Vulpes, which encompasses most true foxes, individuals are predominantly solitary or form monogamous pair bonds outside of the breeding season. These pairs, such as those of the red fox (Vulpes vulpes), defend exclusive territories typically spanning 5 to 20 km², depending on habitat quality and resource availability, with males and females cooperating to raise offspring while maintaining minimal interaction with other adults.^[1]^[22] In contrast, the bat-eared fox (Otocyon megalotis) displays more gregarious tendencies, living in small family units of 2 to 5 individuals comprising a monogamous breeding pair and their pups. These groups occupy home ranges of 0.25 to 1.5 km² and engage in cooperative behaviors that enhance survival, including group foraging and sentinel-like vigilance for predator detection, where one member remains alert while others feed.^[23] The raccoon dog (Nyctereutes procyonoides) maintains a loosely social structure, typically forming monogamous pairs or small family groups that hunt and rest together, with pair bonds persisting year-round. Territoriality is minimal, as home ranges overlap without aggression, and social grooming strengthens pair affiliations; in winter, pairs enter hibernation together, though some populations form loose aggregations of up to several individuals prior to dormancy.^[24] Communication within Vulpini is multifaceted, facilitating social interactions and territory maintenance across genera. Vocalizations include barks for long-distance contact and territorial warnings, as well as screams during breeding or disputes, with over 20 distinct calls documented in species like the red fox. Scent marking via urine and specialized glands, such as the supracaudal gland, conveys individual identity and reproductive status, while visual cues like tail postures—such as a raised tail signaling dominance or a lowered one indicating submission—aid in close-range signaling.^[25]

Diet and foraging

Members of the Vulpini tribe display diverse dietary habits, ranging from predominantly carnivorous to highly omnivorous and specialized insectivory, reflecting adaptations to varied environments. Species in the genus Vulpes, such as the red fox (V. vulpes), are primarily carnivorous, with diets consisting of 50-70% animal matter including rodents, birds, and lagomorphs, supplemented by opportunistic scavenging of carrion.^[26] Invertebrates and plant material, such as fruits and berries, make up the remainder, allowing flexibility in resource-poor conditions.^[27] The raccoon dog (Nyctereutes procyonoides) exhibits a more omnivorous diet, with plant matter comprising approximately 40-50% of its intake, including fruits, roots, and grains, alongside invertebrates like insects and crustaceans, and small vertebrates.^[28] This broad foraging enables it to exploit seasonal abundances, such as aquatic prey in wetter habitats.^[29] In contrast, the bat-eared fox (Otocyon megalotis) is highly specialized, with 70-80% of its diet consisting of insects, particularly termites and beetles, which it excavates from soil using its wedge-shaped muzzle and specialized dentition for crushing exoskeletons.^[30] This insectivory provides essential hydration and nutrients in arid savannas.^[31] Foraging in Vulpini is typically nocturnal or crepuscular to avoid diurnal competitors and align with prey activity. Vulpes species employ a characteristic "mousing" technique, leaping from heights of 1-2 meters to pounce on hidden rodents, relying on acute hearing to detect subsurface movements.^[32] The raccoon dog caches excess food in burrows or under vegetation for later consumption, a behavior that buffers against scarcity.^[33] Dietary composition varies seasonally across Vulpini; for instance, some Vulpes species increase frugivory in winter when vertebrate prey is less available, shifting from rodents to fruits and scavenged remains to maintain energy intake.^[34] These adaptations underscore the tribe's ecological versatility in exploiting fluctuating resources.^[26]

Distribution and habitats

Global distribution

The tribe Vulpini, comprising 17 extant species across four genera, has a native distribution primarily confined to the Holarctic, Afrotropical, and Oriental biogeographic realms, spanning Eurasia, North America, Africa, and northern South America, but absent from most of South America, Australia (natively), and Antarctica. The genus Vulpes, with 12 species, dominates the Holarctic range, occurring from the Arctic tundra of North America and Eurasia—exemplified by the Arctic fox (Vulpes lagopus)—to the deserts of North Africa and the Middle East, such as the fennec fox (Vulpes zerda) in the Sahara.^[35]^[36] The red fox (Vulpes vulpes), the most widespread Vulpes species, extends across Europe, Asia, North America, and northern Africa, adapting to diverse latitudes from boreal forests to semi-arid steppes.^[37] In North America, the genus Urocyon is native, with the gray fox (Urocyon cinereoargenteus) distributed from southern Canada through the United States, Mexico, and Central America to northern South America in Colombia and Venezuela, while the island fox (Urocyon littoralis) is endemic to the Channel Islands of California.^[38] The Afrotropical realm hosts the bat-eared fox (Otocyon megalotis), restricted to eastern and southern Africa from Sudan and Ethiopia southward to South Africa, Namibia, and Botswana, favoring open savannas and grasslands.^[39] The Oriental realm includes the raccoon dog, with two species: the common raccoon dog (Nyctereutes procyonoides) native to East Asia from the Russian Far East through China, Korea, and Japan, and the Japanese raccoon dog (Nyctereutes viverrinus) endemic to Japan.^[40] Human-mediated introductions have expanded Vulpini ranges beyond their native areas, most notably the red fox in Australia, where it was deliberately released for hunting starting in 1855 and has since become widespread across the mainland, covering over 90% of the continent and impacting native biodiversity.^[41] The raccoon dog has also been introduced to Europe, establishing populations in Finland and spreading to neighboring countries since the 1920s, though these remain more localized compared to Australian red fox populations.^[40] Biogeographically, Vulpini's diversification reflects ancient dispersals across the Bering Land Bridge around 5 million years ago, facilitating the spread of ancestral Vulpes lineages from North America to Eurasia and contributing to the current pattern of 17 species native to four continents.^[42] This Holarctic connection, combined with intra-continental radiations, underscores the tribe's adaptability to varied climates while highlighting the role of Pleistocene glacial cycles in shaping modern distributions.^[42]

Habitat types

Vulpini species occupy a wide array of environmental niches, demonstrating remarkable adaptability across terrestrial biomes worldwide. These include forests, grasslands, deserts, tundra, savannas, and scrublands, often in areas with varied vegetation cover and topography that provide foraging opportunities and shelter. For instance, the fennec fox (Vulpes zerda) thrives in arid sandy deserts and stable dunes with sparse vegetation in the Sahara, where annual rainfall is less than 100 mm and no permanent water sources are required.^[43] Similarly, the arctic fox (Vulpes lagopus) inhabits arctic and alpine tundra, including coastal areas with extensive seasonal snow cover that influences den site selection and prey availability.^[43] The bat-eared fox (Otocyon megalotis) is adapted to short-grass plains, open savannas, and arid shrublands in eastern and southern Africa, frequently utilizing landscapes dotted with termite mounds for foraging.^[43] The raccoon dog (Nyctereutes procyonoides) prefers temperate forests, wetlands, and riverine areas in East Asia, often near water bodies in moist, deciduous environments.^[43] Microhabitat preferences within these broader ecosystems emphasize burrowing for thermoregulation, protection, and raising young. Many Vulpini species construct or modify complex underground dens; for example, red foxes (Vulpes vulpes) use extensive burrow systems up to 23 meters long, with multiple chambers and entrances, often in banks, under tree roots, or rocky crevices.^[44] The pale fox (Vulpes pallida) digs burrows 2-3 meters deep and up to 15 meters long in semi-arid Sahel regions.^[43] Elevation ranges span from sea level in coastal and desert zones to over 5,000 meters in high-altitude plateaus, such as the Tibetan fox (Vulpes ferrilata) in alpine meadows and steppes of the Himalayas at 2,500-5,200 meters above sea level.^[43] Vulpini exhibit broad climate tolerance, from extreme cold in polar regions to intense heat in deserts, facilitated by physiological and behavioral adjustments. Arctic species endure temperatures as low as -70°C without shivering, relying on dense fur insulation in snowy tundras. In contrast, desert dwellers like Rüppell's fox (Vulpes rueppellii) survive hyper-arid conditions up to 50°C, obtaining moisture from prey without free water.^[43] Behavioral adaptations, such as nocturnal activity in hot climates to avoid daytime heat, enhance survival across these thermal extremes.^[43]

Evolutionary history

Origin and diversification

The tribe Vulpini originated in North America during the late Miocene, approximately 10–9 million years ago (mya), evolving from primitive members of the subfamily Caninae such as the genus Leptocyon.^[3] This emergence coincided with the appearance of the earliest definitive Vulpini fossils, such as those of the genus Metalopex from late Clarendonian to early Hemphillian deposits in western North America.^[45] Initial diversification took place within Holarctic regions, where environmental variability supported the development of diverse ecological niches among early vulpines, including lineages leading to modern genera like Nyctereutes, Otocyon, and Vulpes. Subsequent key events shaped the tribe's expansion, including a major dispersal from North America to Eurasia via the Bering Land Bridge around 8.5 mya, enabling further radiation across northern continents.^[12] Recent phylogeographic studies suggest this dispersal also involved an early incursion into North Africa around 8.5 mya, with subsequent spread to Eurasia.^[12] Colonization of Africa occurred approximately 7 mya, marked by the oldest known Vulpes species, V. riffautae, recovered from late Miocene sediments in the Djurab Desert of Chad.^[46] Diversification within Vulpini was driven by Miocene climate oscillations, including periods of warming and aridification that promoted niche partitioning and adaptive radiations among fox-like canids. The genus Vulpes underwent significant speciation, radiating into its current 12 species primarily during the Pliocene to Pleistocene (approximately 5–0.01 mya), as cooling climates and habitat fragmentation facilitated isolation and specialization. Recent phylogeographic analyses indicate moderate divergence rates across the tribe, with Nyctereutes branching basally around 11 mya and Otocyon diverging approximately 8.5 mya from other Vulpini lineages.^[11]^[12]

Fossil record

The fossil record of Vulpini is relatively sparse, with the earliest known remains dating to the late Miocene in North America, where small, fox-like forms such as those in the genus Metalopex appear around 9–5 million years ago (mya).^[47] These hypocarnivorous canids, represented by species like M. merriami, are known from sites in western North America, including Oregon, Nevada, and Nebraska, and mark the initial radiation of the tribe in the late Clarendonian to early Hemphillian stages.^[47] Concurrently, the oldest African record comes from the late Miocene of Chad, where Vulpes riffautae fossils, dated to approximately 7 mya, represent an early dispersal of vulpine forms into the continent based on associated fauna.^[46] Subsequent diversification is documented in the Pliocene and Pleistocene, with key extinct genera including Ferrucyon from North America, known from two species in the late Pliocene of Baja California, Mexico (F. avius and a related form), exhibiting mesocarnivorous adaptations distinct from South American cerdocyonines.^[48] Prototocyon, another extinct vulpine genus with at least three species (e.g., P. recki, P. curvipalatus), spans the late Pliocene to early Pleistocene and is recorded from localities in North America, India (Siwalik Hills), and East Africa (e.g., Tanzania), showing omnivorous dental traits.^[49]^[50] In Europe, the Plio-Pleistocene record includes multiple Vulpes species, such as V. alopecoides from around 3 mya in Italy and other Villafranchian sites, based on dentition and postcranial remains that indicate early adaptations to temperate environments.^[51] The overall record encompasses approximately 21 extinct species across these genera, though preservation is fragmentary, particularly relying on isolated teeth and jaws that limit detailed morphological analyses.^[3] Major gaps persist due to poor fossilization in tropical regions, where acidic soils and high humidity degrade remains, resulting in scarce evidence from potential early dispersal routes in Southeast Asia and South America.^[52] A 2020 review highlights the incompleteness of Vulpes phylogeny, attributing it to these fragmentary dentition-based fossils that hinder resolution of interspecific relationships and biogeographic patterns.^[51]

Genera and species

Living genera and species

The tribe Vulpini encompasses three living genera: Vulpes, Otocyon, and Nyctereutes, comprising a total of 15 extant species that represent the diverse fox-like canids within the subfamily Caninae.^[43] These genera are distinguished by adaptations to varied environments, from arctic tundras to temperate forests and arid deserts, with Vulpes forming the core group of "true foxes."^[7] The genus Vulpes includes 12 species, characterized by their slender builds, bushy tails, and opportunistic lifestyles as true foxes. Notable examples include the red fox (V. vulpes), a highly adaptable species widespread across the Northern Hemisphere with body masses typically ranging from 5 to 10 kg, and the fennec fox (V. zerda), a diminutive desert-adapted form weighing less than 2 kg, featuring oversized ears for heat dissipation. Within Vulpes, subgenera such as Alopex encompass specialized forms like the arctic fox (V. lagopus), adapted to cold climates with seasonal fur color changes. Other species include the kit fox (V. macrotis), swift fox (V. velox), corsac fox (V. corsac), Tibetan sand fox (V. ferrilata), Bengal fox (V. bengalensis), Blanford's fox (V. cana), Cape fox (V. chama), Rüppell's fox (V. rueppellii), and pale fox (V. pallida).^[43]^[7] The genus Otocyon is monotypic, consisting solely of the bat-eared fox (O. megalotis), which is readily identified by its exceptionally large ears—up to 15 cm long—that aid in thermoregulation and detecting prey sounds, alongside a specialized dentition suited to an insectivorous diet dominated by termites.^[43] The genus Nyctereutes contains two species of raccoon dogs, both exhibiting bear-like facial markings and plantigrade posture. The common raccoon dog (N. procyonoides), native to East Asia, is omnivorous with a diet including small vertebrates, invertebrates, and fruits, and is one of the few canids capable of true hibernation during winter. The Japanese raccoon dog (N. viverrinus) is a closely related, insular form restricted to Japan, sharing similar morphological and dietary traits but with limited gene flow due to geographic isolation.^[43] Conservation assessments indicate that all 15 Vulpini species are classified as Least Concern by the IUCN Red List as of 2025, reflecting their generally stable populations and broad distributions, though ongoing threats such as habitat fragmentation persist and monitoring efforts continue, particularly for North American species like the kit fox and swift fox.^[53]

Extinct genera and species

The tribe Vulpini encompasses approximately 21 extinct species distributed across at least six genera, primarily documented from North America and Eurasia during the late Miocene to Pleistocene epochs. These fossils reveal a diverse array of early vulpine forms, often exhibiting mesocarnivorous adaptations with dentition intermediate between fully carnivorous and omnivorous states, reflecting transitional ecological roles in forested and open habitats.^[3]^[54] In North America, the genus Leptocyon represents one of the earliest diverging lineages within Vulpini, spanning the Oligocene to Miocene (approximately 34–12 Ma) across sites in Nebraska, South Dakota, Montana, Oregon, and California. This genus includes over ten species, such as L. mollis (early Arikareean, ~30–29 Ma), L. vulpinus (medial Arikareean to early Hemingfordian, ~28–19 Ma), and L. vafer (late Barstovian to late Clarendonian, ~15–12 Ma), characterized by slender premolars, reduced carnassials, and fox-like cranial proportions indicative of agile, small-bodied predators adapted to woodland environments.^[3] Following Leptocyon, Metalopex emerged in the late Miocene (late Clarendonian to early Hemphillian, ~10–8 Ma) in western North America, including California, Nevada, and Oregon, with species such as M. merriami featuring primitive upper molars lacking a postprotocrista and an enlarged mastoid process, suggesting a basal position sister to early Vulpes.^[47] Early Vulpes species in North America include V. stenognathus (late Hemphillian, ~9–7 Ma) from Nevada, Arizona, and Texas, and V. kernensis (early Hemphillian, ~10 Ma) from California, both displaying narrower muzzles and reduced premolar robustness compared to later forms, with dentition supporting a mesocarnivorous diet of small vertebrates and fruits.^[3] Ferrucyon, a monotypic genus with F. avius (early Pliocene, Blancan, ~4.9–2.6 Ma), is known from Baja California Sur, Mexico, and possesses a unique combination of vulpine traits including marked sexual dimorphism in canines and reduced carnassial specialization, positioning it as a North American vulpine possibly linked to early dispersals toward South America around 3–4 Ma, though no successful colonization of the continent by Vulpini is evident in the record.^[48] In Eurasia, extinct Vulpes species from the Plio-Pleistocene (late Pliocene to early Pleistocene, ~5–1.8 Ma) include V. alopecoides (early Pleistocene) from Italy, Hungary, and Greece; V. praecorsac (Pliocene MN14–15 to early Pleistocene) from Ukraine and Romania; and V. praeglacialis (late early Pleistocene) from Austria and Slovakia, all sharing derived features like enlarged braincases and hypocarnivorous dentition suited to cold-steppe environments, with fragmentary remains highlighting the sparse but widespread fossil record of the genus.^[54] The Old World genus Prototocyon, with P. recki (late Pliocene to early Pleistocene, ~3–1 Ma), is documented from Tanzania and India, featuring small size and omnivorous adaptations similar to modern bat-eared foxes, underscoring Asian-African diversification without Holocene extinctions in core Vulpini lineages.^[3] Overall, these taxa illustrate Vulpini's radiation as small, versatile carnivores, with dietary shifts toward mesocarnivory evident in reduced shearing crests across genera.^[47]

References

[1]
Vulpes (foxes) | INFORMATION - Animal Diversity Web
Vulpes is made up of 12 species, but there are about 27 extant species of foxes spread over 9 different genera.
[2]
Vulpes - an overview | ScienceDirect Topics
Genus Vulpes Frisch, 1775 (12 Species). Coccidia of Criado-Fornelio, Gutierrez-Garcia, Rodriguez-Caabeiro, Reus-Garcia, Roldan-Soriano, and Diaz-Sanchez, ...<|control11|><|separator|>
[3]
Phylogenetic Systematics of the North American Fossil Caninae ...
Sep 3, 2009 · The canid subfamily Caninae includes all the living canids and their most recent fossil relatives. Their sister taxon is the Borophaginae.
[4]
https://onlinelibrary.wiley.com/doi/full/10.1111/zsc.12293
[5]
Fennec Fox (Vulpes zerda) Fact Sheet: Taxonomy & History
foxes, wolves, dogs. Genus: Vulpes (Zimmermann, 1780).
[6]
The Twelve Species Of True Foxes - World Atlas
May 11, 2018 · There are 12 species in the genus Vulpes that represents the 'true foxes.'
[7]
Phylogeny of the Caninae (Carnivora, Canidae) : the living taxa
Feb 2, 2023 · Problem taxa include the foxes Urocyon and Otocyon, considered sister taxa, and members of the Vulpini clade osteologically, but either as ...
[8]
Phylogeny of the Caninae (Carnivora): Combining morphology ...
Jun 17, 2018 · Phylogenetic relationships among 36 Recent and 42 extinct species of the Caninae (Canidae) were analysed, based on 360 morphological, developmental, ecological ...
[9]
(PDF) Phylogeny of the Caninae (Carnivora: Canidae): The living taxa
The reconstruction delineates two sister taxa: the foxlike tribe Vulpini, and the wolflike and South American taxa, tribe Canini.
[10]
ASM Mammal Diversity Database
The Mammal Diversity Database Track the latest taxonomic changes to living and recently extinct (i.e., since ~1500 CE) species and higher taxa of mammals. ...ASM Mammal Diversity... · Search Database · Mammal Data ResourcesMissing: Vulpini | Show results with:Vulpini
[11]
https://doi.org/10.1093/evolut/qpad015
[12]
https://doi.org/10.20944/preprints202412.2309.v1
[13]
https://doi.org/10.3389/fevo.2024.1291268
[14]
[PDF] Canid family - Princeton University
The Red Fox-like Canids include a monophyletic group of true Foxes, the Vulpini, closely related to the Red Fox (genus Vulpes): Indian Fox, Corsac Fox, Tibetan ...
[15]
Socio‐ecology of Bat‐eared foxes (Otocyon megalotis)
Aug 7, 2025 · Although the large ears of the bat-eared fox serve a thermoregulatory function to dissipate heat (Sillero-Zubiri et al. 2004) and in ...
[16]
Comparative Neuroanatomical Study of the Main Olfactory Bulb in ...
Our study found greater macroscopic development of the olfactory bulb in both the wolf and fox compared to the dog.Missing: Vulpini | Show results with:Vulpini
[17]
(PDF) Otocyon megalotis - ResearchGate
Aug 9, 2025 · The bat-eared fox is an insectivorous, nocturnal predator that uses its characteristic large ears to detect sounds made by invertebrate prey.
[18]
[PDF] Behavioral and Physiological Adaptations of Foxes to Hot Arid ...
Foxes adapt to hot deserts by avoiding heat during the day, using small body size, non-evaporative heat loss, and low basal metabolic rate.
[19]
Seasonal rhythms of body temperature in the free-ranging raccoon ...
The raccoon dog (Nyctereutes procyonoides) is the only canid with passive overwintering in areas with cold winters, but the depth and rhythmicity of wintertime ...
[20]
Kids' Inquiry of Diverse Species, Vulpes vulpes, red fox - BioKIDS
Red foxes are either nocturnal or crepuscular. Top running speed is about 48km/h and they can jump over obstacles as high as 2 m. In the autumn following ...Missing: researchgate. | Show results with:researchgate.<|separator|>
[21]
Geographical Origin, Delayed Implantation, and Induced Ovulation ...
May 7, 2018 · The red fox (Vulpes vulpes) and swift fox (Vulpes velox) are known to be polymorphic for implantation delays, with delays occurring in only ...
[22]
Vulpes vulpes (red fox) | INFORMATION - Animal Diversity Web
Head and body length ranges from 455 to 900 mm, tail length from 300 to 555 mm, and weight from 3 to 14 kg. Males are slightly larger than females ...Missing: Vulpini | Show results with:Vulpini
[23]
Otocyon megalotis (bat-eared fox) - Animal Diversity Web
The bat-eared fox's name comes from its enormous ears, which are 114 to 135 mm long. ... Bat-eared foxes are susceptible to predators down to the size of jackals ...Missing: hearing adaptations
[24]
Nyctereutes procyonoides (raccoon dog) - Animal Diversity Web
Body weight ranges from 4 to 6 kg in the summer to 6 to 10 kg in the winter before hibernation. On average, individuals in Europe tend to be larger than ...
[25]
Red Fox Behaviour - Communication - Wildlife Online
Foxes have been observed sniffing each other's glands when they meet, suggesting the scent encodes personal information about its owner. Glands are also found ...
[26]
Variation in red fox Vulpes vulpes diet in five continents
May 27, 2022 · Throughout Europe, rodents are the principal food of foxes, followed by plants, invertebrates, birds, lagomorphs, reptiles, and amphibians (Soe ...
[27]
Nutritional ecology of a prototypical generalist predator, the red fox ...
Apr 4, 2024 · Protein energy ranged between 46.6 and 68.3%, lipid energy from 28.9 to 51.7%, while carbohydrate energy made up between 0.7 and 8.15% (Table 3) ...
[28]
Diet composition of the invasive raccoon dog (Nyctereutes ...
Small mammals (BS=31.2, FO=38.7) and vegetable matter (BS=51.3, FO=63.1) were the most important food resources for red foxes and raccoon dogs, respectively.
[29]
Diet of the raccoon dog Nyctereutes procyonoides — a canid with an ...
The diet composition was influenced as well by the landscape structures as by the seasons: in the waterrich study area 2 amphibians (54.1%) and fish (10.8%) ...
[30]
Bat-eared Fox | San Diego Zoo Animals & Plants
The ears are full of blood vessels that shed heat and help keep the fox cool; they also give the fox a very good sense of hearing.Missing: dissipation | Show results with:dissipation
[31]
[PDF] Diet of the bat-eared fox - StuartOnNature
Otocyon megalotis may be considered insectivo- rous with a marked preference for harvester termites (Hodotermes sp.). When harvester ter- mites are less active, ...
[32]
Directional preference may enhance hunting accuracy in foraging ...
Red foxes (Vulpes vulpes) hunting rodents show a specific behaviour known as 'mousing'. The fox jumps high, so that it surprises its prey by striking from above ...
[33]
Diet of the raccoon dog (Nyctereutes procyonoides) - OpenAgrar
The diet composition was influenced as well by the landscape structures as by the seasons: in the waterrich study area 2 amphibians (54.1%) and fish (10.8%) ...<|separator|>
[34]
Variation in the diet of the red fox (Vulpes vulpes) in mountain habitats
The vegetable component of a diet was substituted by plants during winter (9.2%). Fruit prevailed in the red fox diet in the Mountain-ridge during growing ...Missing: variations foxes Vulpini
[35]
Arctic fox - Canid Specialist Group
The species is common in the tundra areas of Russia, Canada, coastal Alaska, Greenland and Iceland. Exceptions are Fennoscandia, islands in the Bering Sea ( ...
[36]
Fennec fox - Canid Specialist Group
This species is widespread in the sandy deserts and semi-deserts of northern Africa, ranging from Western Sahara and Mauritania to northern Sinai.
[37]
Red fox - Canid Specialist Group
The red fox has the widest range of any carnivore, is adaptable, and found across the northern hemisphere, including diverse habitats and urban areas.
[38]
Gray fox - Canid Specialist Group
The Grey Fox is widespread in forest, woodland, brushland, shrubland, and rocky habitats in temperate, semi-arid and tropical regions of North America.
[39]
Bat-eared fox - Canid Specialist Group
The Bat-eared Fox has a disjunct distribution range, occurring across the arid and semi-arid regions of eastern and southern Africa in two discrete populations ...Missing: sentinel | Show results with:sentinel
[40]
Raccoon dog - Canid Specialist Group
The Raccoon Dog has been widely introduced outside of its historic native range, and is now widespread, and common, in northern, central and eastern Europe.
[41]
[PDF] European Red Fox (Vulpes vulpes) - Fact Sheet - PDF
The fox eats almost anything, scavenging and preying on whatever is available. Its main food source is small animals, but it also eats insects and fruit, ...Missing: genus | Show results with:genus
[42]
Evolutionary radiation in canids following continental colonizations
Today, the Caninae is separated into three major clades: True-wolves, Cerdocyonina, and Vulpini (which we hereafter will refer to as wolves, South American ...
[43]
[PDF] Canids: Foxes, Wolves, Jackals and Dogs - Claws & Laws
Canids are foxes, wolves, jackals, and dogs. The Canid Specialist Group is the chief body of expertise on their conservation.
[44]
SUNY ESF Red Fox
The normal manner of locomotion is by walking or trotting, but for brief periods a red fox can run, attaining a speed of about 42 km/h (26 mph). Reproduction.Missing: researchgate. | Show results with:researchgate.
[45]
Arctic fox - Wikipedia
On average males weigh 3.5 kg (7.7 lb), with a range of 3.2 to 9.4 kg (7.1 to 20.7 lb), while females average 2.9 kg (6.4 lb), with a range of 1.4 to 3.2 kg (3 ...
[46]
Phylogenetic systematics of the North American fossil Caninae ...
... Vulpini appear both as mesocarnivores ‪(‬Vulpes spp.‪)‬ and hypocarnivores ‪(‬Metalopex spp.‪)‬ reproducing, on a much smaller scale, the range of ...
[47]
Metalopex , a new genus of fox (Carnivora: Canidae: Vulpini) from ...
Oct 22, 2014 · Metalopex, in the late Clarendonian to early Hemphillian, was the earliest and only member of the Vulpini until its sister taxon Urocyon.
[48]
The oldest African fox (Vulpes riffautae n. sp., Canidae, Carnivora ...
The oldest African fox (Vulpes riffautae n. sp., Canidae, Carnivora) recovered in late Miocene deposits of the Djurab desert, Chad. Naturwissenschaften. 2007 ...Missing: Vulpini | Show results with:Vulpini
[49]
The Pliocene canid Cerdocyon avius was not the type of fox that we ...
avius was related to the origin of South American foxes of the tribe Cerdocyonina, others suggested that it is related to members of the tribe Vulpini. Our ...
[50]
Tribe Vulpini - Hierarchy - The Taxonomicon
1 Genus Vulpes Frisch, 1775 - foxes · 2 Genus Urocyon Baird, 1857 - grey foxes · 3 Genus †Prototocyon Pohle, 1928 · 4 Genus Otocyon Müller, 1836 - bat-eared fox.
[51]
Protocyon orocualensis - PBDB Taxon
Type specimen: OR 1332, a mandible (right and left hemimandibles). Its type locality is El Breal de Orocual 2, which is in a Pliocene/Pleistocene fluvial- ...
[52]
An updated review on the Plio-Pleistocene Vulpes spp. from Europe
May 15, 2020 · Africa—Among Caninae, Vulpes is one of the first genus to enter the Old World, as a 7 Myr-old species was described from Chad (Fig. 1): Vulpes ...
[53]
https://www.iucnredlist.org/
[54]
IUCN Red List of Threatened Species
Our current goals, based on the IUCN Red List Strategic Plan (2021-2030), are to have 260,000 species assessed and to reassess 142,000 of those species to ...Searching The IUCN Red List · Citing The IUCN Red List · IUCN Green Status · 3.1Missing: Vulpes | Show results with:Vulpes
[55]
Unraveling the fossil record of foxes: An updated review on the Plio ...
May 15, 2020 · The main goal of the present paper is to clarify the taxonomy of Early Pleistocene foxes of Europe. The description of the best-preserved ...Missing: Vulpini paper