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Jabiru

The jabiru (Jabiru mycteria) is a large stork species in the family Ciconiidae, recognized as the tallest flying bird in the Americas, with adults reaching heights of 1.2 to 1.5 meters and wingspans of 2.3 to 2.8 meters. Native to the tropical and subtropical wetlands of Central and South America, it inhabits open freshwater marshes, flooded savannas, riverbanks, and ponds from southern Mexico through Central America to northern Argentina, with the largest populations in Brazil and Paraguay. Characterized by its striking appearance, the jabiru features predominantly white plumage, a featherless black head and upper neck, and a massive, upturned black bill measuring up to 30 cm in length that aids in foraging. A distinctive pinkish band encircles the lower neck, which flushes scarlet when the bird is agitated or excited, while a small silver crest adorns the head of adults. Males are slightly larger than females, with straighter bills, and both sexes can weigh up to 8 kg. Jabirus are diurnal and highly social, often foraging in loose groups of up to 50 individuals during the non-breeding season, though they become more solitary during nesting. Their diet consists primarily of , amphibians, crustaceans, and small reptiles caught by sweeping or stabbing with their long bills in shallow water; they are also known to scavenge carrion and occasionally prey on small mammals or birds. Non-migratory within their range, they exhibit seasonal movements tied to water availability and breeding cycles, which typically occur from December to May in monogamous pairs that may last for life. Nests are massive structures of sticks, up to 1.5 meters in diameter, built high in tall trees (15–30 meters above ground) and reused across seasons, with clutches of 2–5 eggs incubated for about 30 days. Although populations face localized threats from habitat loss due to , drainage of wetlands, and , the jabiru is classified as Least Concern on the due to its wide distribution and stable overall numbers. It holds cultural significance in indigenous traditions across its range, often symbolizing strength and the natural environment, and benefits protected status in countries like and under the U.S. Migratory Bird Treaty Act for occasional vagrants in southern . Note that the name "jabiru" is also applied to the unrelated (Ephippiorhynchus asiaticus) in and , but the genus Jabiru is monotypic, referring exclusively to this species.

Taxonomy

Classification

The jabiru (Jabiru mycteria) belongs to the order Ciconiiformes and the family Ciconiidae, the , which comprises 19 extant species distributed primarily in tropical and subtropical regions. It is the sole species in the monotypic genus Jabiru, established by German ornithologist Carl Hellmayr in 1906. The species was originally described by German zoologist Martin Heinrich Carl as Ciconia mycteria in 1819, based on specimens from ; the current binomial name is Jabiru mycteria (, 1819). Molecular phylogenetic analyses, including cytochrome b gene sequences and DNA-DNA hybridization data, position the genus Jabiru within a derived of Ciconiidae that also includes Ephippiorhynchus, Anastomus, and Mycteria, with Ephippiorhynchus species—such as the saddle-billed stork (E. senegalensis) and black-necked stork (E. asiaticus)—representing its closest living relatives based on shared morphological traits like bill structure and genetic distances. Early taxonomic history involved with the (Mycteria americana), as Lichtenstein's use of the mycteria for the jabiru overlapped with the Mycteria established for the wood stork, and the common name "jabiru" has occasionally been applied to the latter in regional contexts; however, the two are distinct, with Jabiru characterized by its monotypic status and phylogenetic separation from Mycteria.

Etymology and Naming

The name "Jabiru" originates from the Tupi–Guaraní languages spoken by , where it translates to "swollen neck," alluding to the bird's prominent inflatable throat pouch. This term entered European languages in the via explorers and reflects the bird's distinctive anatomy as observed by local communities. The term "jabiru" has been applied to other species outside the Americas, leading to occasional nomenclatural confusion. In and , it commonly refers to the (Ephippiorhynchus asiaticus), a large wading distinct from the American jabiru despite superficial similarities in size and habitat. Similarly, in , the (Ephippiorhynchus senegalensis) is known as the "African jabiru," highlighting convergent naming based on shared morphological traits like long bills and leggy builds. In other languages, the American jabiru (Jabiru mycteria) is called Jabiru d'Amérique in and Jabiru-Amerikanischer Tuiuiu in , emphasizing its distribution. A , Jabiru codorensis, was discovered in the early Codore Formation near Urumaco, , consisting of an associated right and tibiotarsus. Described in , this specimen represents the earliest known record of the genus Jabiru and suggests that the lineage had already diversified in northern by the Pliocene, providing insights into the evolutionary history of ciconiids in the Neotropics.

Physical Description

Size and Morphology

The Jabiru (Jabiru mycteria) stands as the tallest flying bird in , with adults measuring 120–140 cm in total length from bill to tail, a of 2.3–2.8 m, and a body weight ranging from 4.3 to 9 kg. These dimensions contribute to its imposing stature, making it one of the largest in the . Sexual dimorphism is pronounced in overall , with averaging about 25% larger than females, while other structural traits exhibit no notable differences between the sexes. Male weights typically fall between 5.9 and 8.1 kg, compared to 4.3–6.4 kg for females, reflecting this size disparity, with also possessing straighter bills and no notable variations in leg proportions. Morphologically, the Jabiru features a long, heavy bill measuring up to 25–30 cm in length and slightly upturned at the tip, ideal for its ecological role. Its legs are elongated and unfeathered, supporting a body built for shallow-water navigation, while the large, partially webbed feet provide stability on soft substrates. A distinctive throat pouch at the base of the neck serves as a structural element, expanding during social displays to signal excitation or intent. In terms of flight adaptations, the Jabiru's broad wings enable efficient soaring over long distances, often at high altitudes, mimicking vulture-like for . On the ground, however, its substantial size renders movement cumbersome, typically necessitating two to three jumps to achieve takeoff.

Plumage and Coloration

The adult Jabiru possesses predominantly white plumage covering its body, wings, and tail, creating a clean, uniform appearance that remains consistent year-round with no seasonal variations. This white feathering contrasts markedly with the featherless skin on the head and upper , which features a small cluster of grey feathers at the . The bare lower includes a distinctive inflatable red pouch at its base, typically deep pink in calm states but capable of intensifying to scarlet when the is agitated; the lores and surrounding facial skin are also . The large, upturned is entirely . Juveniles exhibit duller, less vibrant coloration than adults, with pale upperparts featuring silvery grey-brown feather edges and white primaries lightly washed in pale brown. Their head and are mostly bare and blackish, though sparsely covered in grey feathers, and the throat appears as a duller pinkish-red. Over the first winter, the shifts toward whiter tones, but immatures retain brownish markings and incomplete bare skin development for 2–3 years until fully acquiring the adult pattern.

Distribution and Habitat

Geographic Range

The Jabiru (Jabiru mycteria) is native to Central and , with its range spanning from southern —including the —southward through countries such as , , , , , , , , , , , , , , , , and to northern . The species is absent west of the Mountains, occurring primarily in lowland Neotropical regions east of the . Core populations exhibit the highest densities in wetland systems of Brazil's and Paraguay's Eastern Chaco, where the bird is most abundant due to favorable habitat availability. These areas support significant concentrations, contributing substantially to the species' overall numbers across its range. Vagrant records include occasional sightings in the , such as and , as well as . These extralimital occurrences are rare and typically involve individuals dispersing northward or eastward beyond the native range. The historical range of the Jabiru has remained largely stable, with no major contractions documented prior to the 20th century; populations in some regions, such as , have shown recovery since the 1980s following protective measures and IUCN status improvements from Near Threatened to Least Concern. Overall trends indicate stability in central , though data are limited elsewhere.

Habitat Preferences

The Jabiru (Jabiru mycteria) primarily occupies freshwater wetlands, such as marshes, swamps, , and seasonally flooded grasslands, where it avoids saline environments like coastal mangroves. These habitats provide the open, vegetated, or unvegetated aquatic zones essential for its activities, with the species showing a strong preference for inland freshwater systems over brackish or areas. Nesting sites are typically located in tall emergent trees, including ceiba (Ceiba pentandra), Caribbean pine (Pinus caribaea), and occasionally palms or dead snags, situated within forested wetlands, riparian zones, or transitional areas between savannas and lowlands near permanent or seasonal water bodies. These elevated perches, often 15–30 m in height, offer protection and proximity to foraging grounds while being surrounded by inundated pine-savanna or lagoon systems. For foraging, Jabirus favor shallow waters in open wetlands, savannas, and during dry seasons, they exploit shrinking pools or agricultural edges such as rice fields, where water levels concentrate prey. The demonstrates adaptations to seasonal fluctuations by tolerating flooding in wet periods and dispersing to upland fringes or edges of larger water bodies when wetlands become deeply inundated, thereby maintaining access to suitable conditions.

Behavior and Ecology

Feeding Habits

The Jabiru (Jabiru mycteria) primarily consumes aquatic prey, including fish such as , amphibians like frogs, reptiles including and eels, insects, mollusks, crustaceans such as , and occasionally young caimans or crocodiles and . Small mammals and carrion may also be taken opportunistically, particularly when floodwaters recede and expose terrestrial resources. Foraging occurs mainly in shallow wetlands, where the bird wades methodically with its large held at a 45-degree angle to probe murky water. Prey is detected primarily through tactile sensation rather than sight, with the snapping shut upon contact before the bird tosses its head back to swallow. It may splash water with its bill to flush hidden items or occasionally jog rapidly in pursuit. Jabirus often in flocks during periods of prey abundance, such as when water levels concentrate aquatic life. The exhibits opportunistic behaviors, including scavenging dead or carrion, especially during the when water bodies shrink and alternative food sources become available. In such conditions, groups may cooperatively into shallower areas to facilitate capture, shifting toward more terrestrial prey as options diminish.

Breeding Biology

The Jabiru exhibits a breeding season that varies regionally but is generally tied to environmental cues such as receding water levels in wetlands, which concentrate prey availability during the . In tropical regions like the of , breeding peaks from November to May, with nest building commencing in December and January. In central , the season begins with the transition from wet to dry conditions in November–December, with eggs laid from December to February. Similarly, in the southern of , egg-laying occurs primarily from August to November, aligning with the onset of the dry period. Jabirus breed as solitary pairs, constructing large nests from sticks and woody debris in the upper canopy of tall, emergent trees, typically 15–30 m above ground near riparian forests or wetlands. These nests, often deeper than wide, measure up to 1 m in width and 1.8 m in depth, and are reused annually with additions of new material by both sexes, sometimes persisting for over 10 years. Preferred tree species include Ceiba pentandra and Pinus caribaea in Belize, and Sterculia apetala in Venezuela, where nests are defended within territories of 300–500 m. Clutches consist of 2–5 white eggs, with an average size of 3–3.4 eggs per nest; both parents share duties, which lasts approximately 30 days. Nest success rates are around 47%, with hatching success reaching 71.6% in some populations, though overall chick survival to fledging is approximately 50%. Chicks at 100–115 days after , though estimates range to 12–13 weeks in some areas, and receive continued for 2–3 months post-fledging, during which adults feed and protect the young. Productivity averages 0.9–1.5 fledglings per active nest across studied sites. Jabirus have an average lifespan of 30–36 years in the wild, with some individuals surviving over 40 years in .

Social Structure and Movements

The Jabiru (Jabiru mycteria) exhibits a that varies by season and activity, typically appearing solitary or in small family units outside of periods, though it forms loose aggregations during and roosting. These groups, often comprising small numbers of individuals, congregate particularly in the at shrinking water pools, where they may exhibit cooperative behaviors such as herding into shallows. sizes remain modest, rarely exceeding dozens, and include mixed-species assemblies with other wading birds. In territorial or contexts, Jabirus employ distinctive displays involving the inflation of their red throat pouch, which signals excitement or readiness, accompanied by rapid bill-clattering and neck-waving gestures. These vocal and postural signals facilitate communication within pairs or groups, reinforcing bonds or deterring intruders without escalating to physical conflict. The is non-migratory but displays nomadic tendencies, with individuals shifting ranges in response to seasonal fluctuations in water levels and prey availability, often dispersing to follow flooded wetlands. Juveniles, upon fledging, undertake wider dispersal from natal areas, occasionally appearing as considerable distances from core habitats, though specific distances vary by local conditions. No long-distance migrations occur, but such movements enable adaptation to environmental variability across their tropical range. Roosting is communal, with birds gathering at night in tall trees adjacent to water bodies, providing safety from predators and facilitating interactions before dawn . These sites are often reused across seasons, promoting group cohesion outside .

Conservation

Population Status

The global population of the Jabiru (Jabiru mycteria) is estimated at 20,000–85,000 mature individuals, based on assessments by and Partners in Flight. This figure reflects a wide-ranging across Neotropical wetlands, with the overall population considered stable, though precise trends remain difficult to determine due to challenges in monitoring large, remote habitats. The species' conservation status has shown improvement over time, shifting from Near Threatened in 1988 to Least Concern in 2000, with the 2021 evaluation confirming Least Concern status, which has remained unchanged as of 2025. This upgrade aligns with better understanding of its extensive and resilience in key areas, though local variations persist. Legally, the Jabiru is listed under Appendix I of the Convention on International Trade in Endangered Species of Wild Fauna and Flora (), prohibiting international commercial trade to prevent exploitation. In the United States, where it occurs as a rare vagrant, it is protected under the Migratory Bird Treaty Act, safeguarding it from take or harm. Nationally, protections include designation as a protected species in since 1973, which has contributed to gradual population recovery in that region. While the Jabiru is not locally abundant across its range, with densities typically low (0.05–0.16 nests/km² in Central American wetlands), the highest concentrations occur in the Brazilian , where nest densities can reach up to 0.17 nests/km² during years of extensive flooding. These peak conditions in the support the largest known breeding aggregations, underscoring its importance as a core stronghold for the species.

Threats and Protection

The Jabiru (Jabiru mycteria) faces several primary threats stemming from activities that degrade its habitats. drainage for , particularly in regions like and the Brazilian , has significantly reduced suitable foraging and nesting areas, leading to . , including pesticides and water contamination from agricultural runoff, indirectly affects the species by contaminating prey such as and amphibians, disrupting the in floodplains. Direct for sport, food, or feathers, though historically more prevalent, persists at low levels in some areas, with nestlings occasionally targeted despite legal protections. exacerbates these issues by altering seasonal flood cycles, which can diminish breeding success and prey availability in dependent ecosystems. Human impacts further compound these threats, primarily through nest disturbance in expanding farmlands where agricultural activities encroach on traditional nesting sites in tall trees near . Due to its large size and imposing presence, the Jabiru experiences relatively low direct persecution from humans compared to smaller wetland birds, though incidental disturbances from development can still lead to nest abandonment. Conservation efforts for the Jabiru focus on habitat preservation and international cooperation. Key protected areas, such as the Conservation Complex in —a —encompass critical habitats and cover a significant portion of the species' range, providing safeguards against drainage and development. restoration projects in regions like the aim to rehabilitate degraded areas through sustainable water management and reforestation to support flood regimes essential for the species. Monitoring initiatives, including population surveys and genetic studies initiated after 2010, utilize camera traps and satellite telemetry analogs for related to track movements and assess use, informing targeted protections. The species is listed under Appendix I, restricting , and receives legal protection in countries like since 1973, contributing to localized population recoveries. The future outlook for the Jabiru remains stable in core wetland strongholds like central if ongoing conservation of persists, but populations in fragmented northern ranges may experience declines without intensified habitat safeguards.

References

  1. [1]
    Jabiru Stork Facts | Brazil Wildlife Guide - Natural Habitat Adventures
    The jabiru stork holds the title for largest flying bird in the Americas. It grows 4 to 5 feet tall and has a wingspan of 9 to 12 feet.
  2. [2]
    Jabiru mycteria - Animal Diversity Web
    Jabiru can grow as tall as 1.15 m and weigh as much as 8 kg. Their wingspan averages 2.6 m. The beak is upturned, black, and broad, and can extend to 30 cm. The ...
  3. [3]
    Black-necked Stork - The Australian Museum
    The Black-necked Stork is the only stork in Australia, with black and white plumage, a dark green and purple neck, and a massive black bill. It inhabits ...Fast Facts · Distribution · Breeding Behaviours<|control11|><|separator|>
  4. [4]
    Orders of Birds - IOC World Bird List
    The Order Ciconiiformes includes only the storks (Ciconiidae). Ibises and spoonbills (Threskiornithidae) and herons (Ardeidae) are members of the Pelecaniformes ...
  5. [5]
    Ciconiidae - Storks - Birds of the World
    Ciconiidae is the sole family in the order Ciconiiformes. This order traditionally included many other long-legged wading birds, such as Ardeidae and ...
  6. [6]
    Jabiru mycteria - Birds of the World
    In past, sometimes included in genus Ephippiorhynchus, which it resembles in feeding and display behaviour. Monotypic. Subspecies. Monotypic. Distribution. SE ...Missing: classification | Show results with:classification<|control11|><|separator|>
  7. [7]
    Jabiru mycteria (Jabiru) - Avibase
    Photo powered by flickr.com. Classification. Order: Pelecaniformes Family: Ciconiidae Genus ...
  8. [8]
  9. [9]
    Integumentary Colour Allocation in the Stork Family (Ciconiidae ...
    Mar 17, 2021 · One clade includes four genera (Jabiru, Ephippiorhynchus, Anastomus, and Mycteria) with nine species, and the other two genera (Ciconia and ...
  10. [10]
    [PDF] The Generic Names Mycteria and Tantalus of Linn[ae]us, 1758
    and the specific name wycteria, given it by Lichtenstein (1. c.) in. 1819 = Jabiru mycteria (Liehr.) Hellre. Marcgrave's Jabiru brasiliensibus is a large bird, ...<|separator|>
  11. [11]
    jabiru - WordReference.com Dictionary of English
    another name for saddlebill. Etymology: 18th Century: via Portuguese from Tupi-Guarani. 'jabiru' also found in these entries (note: many are not synonyms or ...Missing: origin | Show results with:origin
  12. [12]
    Saddle Billed Stork - CITES
    Common name: Saddle-billed Stork, African Jabiru ; Scientific name: Ephippiorhynchus senegalensis ; Distribution: Africa ; CITES listing: Appendix III (Ghana, 26/ ...
  13. [13]
    The first Cenozoic fossil bird from Venezuela | PalZ
    The first Cenozoic avian remains from Venezuela are described. The material comprises an associated right tarsometatarsus and tibiotarsus from the earliest.
  14. [14]
    Jabiru Stork (Jabiru mycteria) Information - Earth Life
    Sep 11, 2025 · The bill is large, reaching up to 30 cm (nearly 1 foot), black, broad, and slightly curved at the tip. It's a powerful tool that can catch prey.Missing: length morphology
  15. [15]
    Jabiru - Oiseaux-Birds
    Both adults are similar in plumage, but the male is larger than the female and has longer bill. Immature is rather brownish-grey, and becomes whiter little by ...Missing: morphology throat
  16. [16]
    Jabiru - eBird
    Flies strongly and often high overhead, sometimes even soaring like a vulture. Plumage is wholly white (no black in wings in flight) but the naked head and neck ...
  17. [17]
    Jabiru | Audubon Field Guide
    Conservation. Conservation Status. IUCN Red List Status: Least Concern. EX. EW. CR. EN. VU. NT. LC. Extinct. Threatened. Least Concern. Take Action. Visit Birds ...
  18. [18]
    None
    ### Summary of Jabiru mycteria Plumage, Coloration, Bare Parts, Juvenile Appearance, and Variations
  19. [19]
    Jabiru mycteria - Oiseaux.net
    Jul 30, 2023 · The American Jabiru is one of a kind (Jabiru). It is one of the largest storks in the world, reaching heights of up to 1.6 meters (130-140 cm on average).<|control11|><|separator|>
  20. [20]
    Jabiru Jabiru Mycteria Species Factsheet | BirdLife DataZone
    This species has an extremely large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence ...<|control11|><|separator|>
  21. [21]
    Wildlife Jabiru - WCS Paraguay
    The Jabiru is the largest stork in the western hemisphere, weighing in at nearly 8 kilograms and can reach a height of 122-140 cm with a wingspan close to 3 ...Missing: weight bill length sexual dimorphism
  22. [22]
    The state of stork research globally: A systematic review
    Among these species is the Jabiru, which was listed as Near Threatened in 1988 and then Unknown between 1994 and 2004 before being reassigned as Least Concern.
  23. [23]
    (PDF) Breeding biology of Jabirus (Jabiru mycteria) in Belize
    Young birds fledged 100 to 115 days after hatching but were still dependent on parents. From 1968 to 1987, a total of 44 eggs and 92 nestlings were counted.
  24. [24]
    [PDF] Breeding Biology of the Jabiru in the Southern Llanos of Venezuela
    Sep 1, 1996 · Rainfall is very scarce between November and. April (dry season), when much of the land becomes dry and water is restricted to a few streams, ...
  25. [25]
    Jabiru Stork - Lamar University
    Aug 11, 2025 · Taxonomy: Kingdom: Animalia. Phylum: Chordata. Class: Aves. Order: Ciconiiformes. Family: Ciconiidae. Genus: Jabiru. Species: J. mycteria ...
  26. [26]
    Tallest flying bird in South America - Facebook
    Mar 2, 2021 · The young fledge around 110 days old and they often spend around another 3 months in the care of their parents. The storks return to the same ...
  27. [27]
    Appendices | CITES
    Jabiru mycteria. Mycteria cinerea. Family. Phoenicopteridae. Flamingos. Phoenicopteridae spp. Family. Threskiornithidae. Ibises, spoonbills. Eudocimus ruber.
  28. [28]
    50 CFR 10.13 -- List of Birds Protected by the Migratory Bird Treaty Act.
    § 10.13 List of Birds Protected by the Migratory Bird Treaty Act. (a) ... Jabiru mycteria. Jacana, Northern Jacana, Jacana spinosa. Jackdaw, Eurasian ...
  29. [29]
    How much can the number of jabiru stork (Ciconiidae) nests vary ...
    Aerial survey was used to estimate the density of jabiru nests along transects covering the Pantanal wetland in Brazil, between parallels 16° and 20°S (about ...Missing: pairs | Show results with:pairs
  30. [30]
    Jabiru - Costa Rica Focus
    Range and Habitat of Jabiru · Geographic Range. Found from Mexico through Central America, including Costa Rica, and into South America down to Argentina.
  31. [31]
    Effects of Severe Floods and Droughts on Wildlife of the Pantanal ...
    They also catch snails (Pomacea spp.). Jabirus are not present in the Pantanal during the flooding season. They migrate to higher ground to still unknown sites.
  32. [32]
    Jabiru Bird Facts - Jabiru mycteria - A-Z Animals
    Predators, Threats, and Conservation Status. The IUCN lists the jabiru as LC or “least concern.” Due to its extensive range and moderately large population, ...
  33. [33]
    Genetic characterization of Neotropical Jabiru Storks - USGS
    Jabiru Stork (Jabiru mycteria is listed under Appendix I of CITES and considered threatened in Central America. The first population genetic analysis of Jabiru ...