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Besra

The Besra (Tachyspiza virgata), also known as the besra sparrowhawk, is a small to medium-sized raptor in the family Accipitridae, measuring 29–36 cm in length with a wingspan of 50–65 cm, characterized by short broad wings, a long rounded tail, and adaptations for maneuvering through dense vegetation.^[1]^[2] Adults exhibit a grayish-brown upper body with a grayer head and neck, pale underparts marked by orange barring and blotches, a dark mesial stripe on the whitish throat, and four to six dark tail bands of equal width to the pale interspaces; females are noticeably larger than males, while juveniles are browner above with streaked underparts.^[3]^[1] It is a widespread resident breeder in dense forests across southern Asia, ranging from the Indian subcontinent (including southwestern India and Sri Lanka) eastward through Southeast Asia to southern China, Indonesia, and parts of the Himalayas, favoring habitats such as deciduous woodlands, hilly terrain, and closed-canopy shrublands.^[4]^[5]^[6] The species preys primarily on small birds, insects, and reptiles, employing ambush tactics from perches, and it is currently classified as of Least Concern globally due to its large range, though the population is suspected to be decreasing owing to ongoing habitat loss in some areas.^[1]^[6] Breeding occurs in spring to early summer, with nests built high in trees using twigs and leaves, typically producing 2–4 eggs per clutch.^[7]

Taxonomy

Classification and nomenclature

The Besra (Tachyspiza virgata) is a small bird of prey belonging to the family Accipitridae, which encompasses hawks, eagles, and Old World vultures. Within this family, it is placed in the genus Tachyspiza, a grouping of swift, forest-dwelling raptors adapted for agile hunting in dense vegetation. This genus includes close relatives such as the Japanese Sparrowhawk (Tachyspiza gularis) and the Brown Goshawk (Tachyspiza fasciata), with phylogenetic analyses indicating that the Besra and Japanese Sparrowhawk form a sister clade to the Brown Goshawk, supported by shared morphological traits like short, rounded wings and barred underparts, as well as molecular data from ultraconserved elements. While the International Ornithological Congress (IOC) and Clements Checklist recognize Tachyspiza, BirdLife International retains the classification under Accipiter virgatus as of 2025.^[6] The common name "Besra" originates from local Asian languages, particularly the Hindi term "besra," which has been used by indigenous communities in the Indian subcontinent to refer to this species and similar small hawks. The scientific binomial Tachyspiza virgata reflects its distinctive characteristics: the genus name derives from Ancient Greek tachys (meaning "swift") and spizias (meaning "sparrowhawk"), alluding to the bird's rapid, sparrowhawk-like flight maneuvers through forested habitats; the specific epithet virgata comes from Latin virgatus, denoting "streaked" or "barred," in reference to the prominent streaking on its underparts.^[8] Historically, the Besra was classified within the large, polyphyletic genus Accipiter since its original description as Falco virgatus by Johann Friedrich Gmelin in 1788, later transferred to Accipiter. Taxonomic revisions began with early molecular studies in the 2000s highlighting the non-monophyly of Accipiter, but the genus Tachyspiza—originally proposed by Johann Jakob Kaup in 1844—was not formally resurrected until 2024. This change was driven by comprehensive phylogenetic research using nuclear and mitochondrial DNA, including ultraconserved elements, which confirmed deep divergences within Accipiter and necessitated splitting it into multiple genera to reflect evolutionary relationships; Tachyspiza now accommodates 27 species, including the Besra, based on shared ancestry and morphological convergence in flight adaptations.^[9]^[10]

Subspecies

The Besra (Tachyspiza virgata) is divided into ten recognized subspecies, differing mainly in body size, underpart coloration, barring extent, and tail patterns, with island forms generally smaller than mainland ones.^[1] The nominate subspecies, T. v. virgata, inhabits Java and Bali, featuring rufous sides to the breast and a mottled, streaked center with dark brown and black markings.^[1] T. v. affinis is distributed across northern India, Nepal, central China, and Indochina, representing the largest subspecies overall and being relatively long-winged.^[1] In the mountains of Taiwan, T. v. fuscipectus occurs, also among the largest and long-winged forms.^[1] Southwestern India and Sri Lanka host T. v. besra, with possible extension to southeastern India.^[1] T. v. abdulalii is restricted to the Andaman Islands and potentially the Nicobar Islands.^[1] In the northern and central Philippines (including Luzon, Catanduanes, Mindoro, Panay, and Negros), T. v. confusa predominates, distinguished by a rich red breast, barring limited to the thighs, and larger size compared to other Philippine subspecies.^[1] The southeastern Philippines (Samar, Biliran, Leyte, Cebu, Bohol, Siquijor, and Mindanao) are home to T. v. quagga, which lacks barring on the underparts and thighs, has narrower dark tail bands, and shows a less prominent mesial throat line.^[1] T. v. rufotibialis resides in northern Borneo, notable for its much redder underparts.^[1] On Sumatra, T. v. vanbemmeli is found, exhibiting particularly red underparts.^[1] Finally, T. v. quinquefasciata occupies Flores in the Nusa Tenggara Islands (Lesser Sundas).^[1]

Description

Size and morphology

The Besra (Tachyspiza virgata) is a small to medium-sized raptor, with a body length ranging from 24 to 36 cm and a wingspan of 42 to 70 cm. Males typically weigh 83 to 140 g, while females are heavier at 131 to 215 g, reflecting pronounced sexual dimorphism where females are 15 to 25% larger than males overall.^[1] This size variation is consistent across subspecies, though island forms tend to be smaller and continental ones, such as T. v. affinis and T. v. fuscipectus, exhibit the largest dimensions and longest wings.^[1] Morphologically, the Besra features short, broad, rounded wings and a long tail, complemented by a smallish bill and rounded head. The tail displays four to six dark bands of equal width to the intervening pale interspaces, aiding in structural balance during flight. A distinctive dark mesial stripe runs down the otherwise whitish throat, serving as a key identifying feature.^[1]^[5] These traits represent adaptations suited to the Besra's forest-dwelling lifestyle, where rounded wings and a long tail enable agile, maneuverable flight through dense vegetation for perch-hunting small birds and mammals. The compact head and bill facilitate quick strikes, while the overall build supports rapid acceleration and tight turns essential for capturing elusive prey in wooded habitats.^[1]^[5]

Plumage variation

The plumage of the Besra (Tachyspiza virgata) exhibits notable sexual dimorphism and age-related differences, characterized by variations in coloration and barring patterns across the upperparts, underparts, and head.^[1] Adult males display slate-black to blackish-brown upperparts, including a grayer head and neck with dark blue cheeks, while the underparts feature cinnamon-rufous breast and flanks, fine black barring on the belly and thighs, and unmarked white undertail coverts.^[1]^[3] In contrast, adult females possess browner upperparts than males, with a similar pattern overall.^[1]^[5] Juveniles differ markedly from adults, featuring streaked brown upperparts and whitish underparts with brown streaks on the breast transitioning to barring on the flanks and belly, overall appearing browner and lacking the slaty tones of mature birds.^[1]^[7] This juvenile plumage molts into adult coloration within the first year.^[1] Subspecies variations influence plumage tone and barring intensity, with northern forms such as T. v. affinis generally darker above and more heavily barred below compared to southern populations.^[1] For instance, T. v. virgatus shows rufous sides to the breast with a mottled and streaked dark brown and black center, while T. v. confusus has a rich red breast with barring restricted to the thighs, and T. v. quagga features solidly rufous underparts without barring and narrower tail bands.^[1]

Distribution and habitat

Geographic range

The Besra (Tachyspiza virgata) is distributed across much of South and Southeast Asia, with a breeding range extending from the Indian subcontinent through the Himalayan foothills and into eastern and southeastern regions. It breeds in northern India, Nepal, Bhutan, and Bangladesh, as well as in southern China and Taiwan. Further east, the breeding range encompasses Southeast Asian countries including Myanmar, Thailand, Vietnam, the Philippines, and the Indonesian islands of Borneo, Sumatra, Java, and Bali, along with the Andaman Islands.^[1]^[6] Populations in southern parts of the range, such as southern India, Sri Lanka, and much of Indonesia and the Philippines, are largely sedentary year-round. In contrast, northern breeding populations, particularly those in the Himalayas, northern India, Nepal, and parts of China, exhibit partial migration, with individuals moving southward or to lower elevations during the non-breeding season. These migrants winter primarily in peninsular India, Indochina (including Thailand, Laos, Cambodia, and Vietnam), and Indonesia, though movements are generally local and altitudinal rather than long-distance.^[1] The species occupies a broad elevational gradient, from sea level up to 3,440 m, with most records below 2,200 m; it has been observed breeding at high altitudes, such as 3,300 m in spruce forests in Sichuan, China. Globally, the Besra population is estimated at 40,000–400,000 mature individuals (2021), reflecting its widespread but fragmented distribution in forested habitats across Asia.^[1]^[6]

Habitat preferences

The Besra (Tachyspiza virgata) primarily inhabits dense forested environments that offer ample cover for hunting and nesting, favoring broadleaf evergreen and deciduous forests with closed canopies. These habitats provide the structural complexity needed for the bird's short, agile flights to ambush small birds and reptiles. Secondary forests, which have undergone some disturbance but retain significant tree cover, are also frequently used, allowing the species to persist in moderately altered landscapes.^[1]^[6] The species shows notable tolerance for human-modified areas, including plantations such as tea and rubber estates, as well as mangroves in coastal regions, where it exploits edges for foraging without venturing into open country. It avoids expansive agricultural fields or grasslands lacking vertical structure, preferring instead environments that maintain a balance of concealment and accessibility for prey capture. This adaptability enables the Besra to occupy a range of modified habitats while relying on forested cores for breeding.^[1]^[6]^[11] Elevational preferences span from lowlands near sea level to montane highlands up to 3,440 m, though it is most common below 2,200 m in subtropical and tropical moist forests. For breeding, the Besra selects sites with dense vegetation near streams or ravines, nesting in large trees 10–25 m above ground to leverage the surrounding cover for protection and hunting efficiency. Climatically, it thrives in humid conditions with annual rainfall exceeding 1,500 mm, underscoring its dependence on moist ecosystems.^[1]^[6]^[12]

Behavior and ecology

Daily activities and movement

The Besra (Tachyspiza virgata) exhibits a predominantly sedentary lifestyle across most of its range in tropical and subtropical Asia, remaining in forested habitats year-round without long-distance migrations. However, populations in northern India and Nepal display partial migratory behavior, with individuals descending to lower plains during winter months to escape colder highland conditions. This altitudinal movement is limited, and the species is considered an uncommon migrant in areas like Thailand from October to November.^[5]^[1] In terms of locomotion, the Besra is highly adapted for agile movement through dense forest environments, relying on short, broad wings and a long tail that enable rapid turns and precise navigation among branches and foliage. Its typical flight pattern consists of quick bursts of flapping followed by glides ("flap-flap-glide"), allowing for efficient short-distance travel and occasional soaring over clearings or ridges. The bird frequently perches inconspicuously on tall dead trees or high branches to scan surroundings, using these vantage points for brief rests and orientation before resuming activity. These flight characteristics support sudden, maneuverable dashes, such as those employed in hunting from concealed positions.^[13]^[5] The Besra's daily routine is characterized by peaks in activity during crepuscular periods at dawn and dusk, when it is most mobile in search of opportunities within its woodland territory, alongside moderate activity in mid-morning and late afternoon. Overnight, it roosts in dense foliage of large trees, selecting sheltered sites that provide cover from predators and weather. This pattern aligns with its forest-dwelling habits, minimizing exposure during vulnerable hours.^[14]^[15]

Diet and foraging

The Besra's diet consists primarily of birds, supplemented by insects and a smaller proportion of reptiles and mammals. Analysis of prey delivered to nests in northern Taiwan revealed that birds comprise approximately 58% of the diet by frequency, including small passerines and doves, while insects account for about 32%, such as beetles and dragonflies. Lizards and small mammals, including bats and rodents, make up the remaining 10%, with examples encompassing various skinks and murid rodents. By biomass, birds dominate at 82.5%, underscoring their nutritional importance, whereas insects contribute minimally at 4.4%.^[16] The Besra is an opportunistic predator that employs ambush tactics from concealed perches in dense forest cover to surprise prey, often launching short, agile pursuits at low levels through vegetation. It also conducts ground-level attacks on insects and lizards, particularly in understory habitats, and occasionally robs nests for avian prey. These strategies target species active in the canopy, mid-strata, and shrubs rather than ground-dwellers, enhancing success in cluttered environments. The bird's agile flight facilitates rapid maneuvers during chases, enabling it to navigate thick foliage effectively.^[16]^[6]^[5] Prey items range from small to medium size, typically weighing 1.5–250 g, with the largest comparable to a quail such as the Bamboo Partridge. Seasonal variations occur, with birds forming over 85% of the diet by frequency during the early breeding period (late April–May), shifting to around 50% birds and 40% insects by July–August as insect availability increases in non-breeding months. This adaptability reflects opportunistic foraging aligned with prey abundance.^[16]

Reproduction

Breeding biology

The breeding season of the Besra (Tachyspiza virgata) varies widely across its range, typically spanning January to September in continental Asia, with regional differences influenced by local climate and migration patterns. In southern India and Sri Lanka, breeding occurs from January to June, while in northern India it is concentrated from March to June; further north in China and Borneo, it extends from May to September. In the Philippines, where the species is resident, breeding occurs from April to July.^[1] Courtship behaviors in the Besra involve monogamous pairs engaging in aerial displays to strengthen pair bonds and attract mates. These displays include high-speed chases through the forest canopy, calling flights with sharp, repetitive vocalizations, and acrobatic maneuvers that showcase the birds' agility. Such rituals typically precede nest site selection, where pairs choose elevated locations in dense forest trees overlooking ravines or clearings.^[14]^[5]^[1] The female Besra lays a clutch of 3–4 eggs, ranging from 2–5 in exceptional cases, which are white with reddish-brown markings. Incubation lasts approximately 28 days and is performed by both parents, though the female undertakes the majority of the duties while the male provides food. This biparental care ensures the eggs' protection and warmth during the early reproductive phase.^[1]^[5]^[12]

Nesting and parental care

The Besra constructs a shallow platform nest composed of sticks, typically placed in the fork of a tree branch 10–25 m above the ground, and lined with fresh green leaves. Nests are often built anew each year but may be reused and renovated with additional twigs and foliage.^[5]^[12]^[17] Incubation of the 2–5 eggs, which are white with reddish-brown markings, lasts approximately 28 days and is primarily performed by the female, who is provisioned with food by the male. The female continues to brood the altricial chicks after hatching, shielding them from weather and predators, while the male delivers prey items such as small birds and lizards to the nest. The nestling period spans 22–23 days, during which the chicks are fed small pieces of meat by the female; fledging occurs at 22–23 days post-hatching.^[16]^[5]^[17] Biparental care persists after fledging, with both adults feeding the young for 2–4 weeks as they remain dependent and practice flight near the nest site; the female often takes a more active role in guarding the fledglings against threats. Feeding occurs 3–5 times daily during the nestling and early post-fledging stages.^[16]^[17]^[12]

Conservation status

Population and threats

The global population of the Besra (Tachyspiza virgata) is estimated at 40,000–400,000 mature individuals, based on the 2021 IUCN assessment of its extensive range across Asia.^[6] This equates to a large overall population that does not meet thresholds for vulnerability under IUCN criteria.^[6] However, the species is suspected to be decreasing at a rate of 5–15% over three generations (2016–2028), driven primarily by habitat degradation, though it remains stable in some core forested areas.^[6] The Besra is classified as Least Concern on the IUCN Red List as of 2021, reflecting its wide distribution and adaptability to various woodland habitats, but with ongoing monitoring recommended due to emerging pressures.^[6] Locally, populations are more vulnerable in fragmented ranges, such as the Philippines, where rapid declines have been observed owing to intense habitat alteration.^[6] The primary threat to the Besra is deforestation for agriculture and logging, which has resulted in an estimated 8.9% loss of forest cover across its range from 2001 to 2020, particularly impacting lowland forests in India, the Philippines, and Java.^[6] Additional risks include illegal hunting and trapping, which contribute to localized population reductions in parts of its Asian distribution.^[18] Pesticide contamination poses an indirect threat by affecting prey availability, as the species accumulates toxins through its insectivorous and avian diet, exacerbating declines in agricultural margins.^[18]

Protection efforts

The Besra (Tachyspiza virgata) benefits from occurrence within several protected areas across its range, which help safeguard its forested habitats. In India, the species has been recorded in Namdapha Tiger Reserve, a biodiversity hotspot in Arunachal Pradesh that encompasses subtropical and tropical forests essential for raptor conservation.^[19] Similarly, in Indonesia, the Besra inhabits Gunung Leuser National Park in Sumatra, a UNESCO World Heritage Site protecting extensive lowland and montane rainforests where the bird forages. In the Philippines, sightings occur in national parks such as Mount Makiling and Kitanglad Range, where dense forest cover supports the species amid broader biodiversity protection efforts.^[20]^[21] Legally, the Besra is afforded international protection under CITES Appendix II, which regulates trade to prevent overexploitation, and CMS Appendix II, promoting cooperative conservation for migratory species.^[6] It is also included in Category 2 of the Raptors Memorandum of Understanding, encouraging habitat protection and threat mitigation across its Asian range.^[6] Nationally, in India, the species is protected under the Wildlife (Protection) Act, 1972, which prohibits hunting and trade of scheduled wild animals, including most birds of prey.^[22] In China, the Wildlife Protection Law safeguards wild birds through prohibitions on unauthorized capture and habitat destruction, aligning with the Besra's status in southern regions.^[23] Research and monitoring efforts contribute to understanding and supporting Besra populations. BirdLife International conducts regular assessments, evaluating the species' conservation status as Least Concern while tracking habitat trends through global data synthesis.^[6] Citizen science platforms like eBird facilitate ongoing tracking by aggregating observer records from across the Besra's range, enabling distribution mapping and population trend analysis.^[3] Additionally, reforestation projects in Southeast Asia, such as those restoring degraded forests in Sumatra and the Philippines, indirectly aid habitat recovery for forest-dependent raptors like the Besra by countering deforestation pressures.^[7]

References

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Besra - Tachyspiza virgata - Birds of the World
Oct 22, 2024 · Small sparrowhawk with smallish bill and head, rounded wings, dark mesial stripe on whitish throat, and four to six dark tail-bands of equal width to pale ...
[2]
Besra (Accipiter virgatus) - Thai National Parks
This bird is a medium-sized raptor (29 to 36 cm) with short broad wings and a long tail, both adaptations to fast maneuvering through dense vegetation. The ...
[3]
Besra - eBird
A medium-sized Accipiter of forested areas. Adult grayish brown above with a grayer head and neck, pale underparts with orange barring and blotches.
[4]
Besra - Facts, Diet, Habitat & Pictures on Animalia.bio
The besra is a widespread resident breeder in dense forests throughout southern Asia, ranging from the Indian subcontinent eastwards across Southeast Asia and ...
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Besra (Accipiter virgatus) - Planet of Birds
Aug 27, 2011 · The Besra is a widespread resident breeder in dense forests throughout south Asia from Pakistan and India to south China and Indonesia. Habitat.
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Besra Accipiter Virgatus 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.
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Besra - Stay connected with nature and your friend - Bird Buddy
The Besra tends to nest high in trees, using twigs and leaves to build a sturdy structure. Breeding typically occurs during the spring and early summer months, ...<|control11|><|separator|>
[8]
Paleotropical and Australasian Accipiters (Genus Tachyspiza)
Tachyspiza is a genus containing goshawks and sparrowhawk in the family Accipitridae. The species were formerly placed in the genus Accipiter.Missing: etymology | Show results with:etymology
[9]
Tachyspiza virgata (Besra) - Avibase
The besra, also called the besra sparrowhawk, is a bird of prey in the family Accipitridae. Source: Wikipedia. (0 votes). Photo powered by flickr.com ...
[10]
Taxonomic Updates - IOC World Bird List
Move the phylogenetically distinct Tiny Hawk and Semicollared Hawk from Accipiter to the newly described genus Microspizias (Sangster et al. 2021; SACC 942) ...
[11]
[PDF] The Diet of Besra Sparrowhawk ( Accipiter virgatus ... - NTU scholars
The habitat is primarily broadleaf evergreen forests, with scattered conifer plantations, farmland, and grassland. This diverse landscape provided nesting and ...Missing: preferences | Show results with:preferences
[12]
[PDF] First breeding record of Besra Sparrowhawk Accipiter ... - Indian Birds
The Besra Sparrowhawk Accipiter virgatus besra Jerdon,. 1839 is a forest-dwelling, rare, resident raptor found in the southern Indian hills (Davison 1883).Missing: morphology adaptations
[13]
The Besra (Accipiter virgatus) Information | Earth Life
Jul 12, 2023 · This bird is a medium-sized raptor (29-36cm) with short broad wings and a long tail, both adaptations to fast maneuvering. The normal flight of ...Missing: movement | Show results with:movement
[14]
BESRA SPARROWHAWK (ACCIPITER VIRGATUS)
May 5, 2025 · The Besra Sparrowhawk is a small to medium-sized raptor, with a body length ranging from 25 to 35 cm and a wingspan of 50 to 65 cm.
[15]
Accipitridae) in the urban areas of the Andaman Islands, India
Dec 26, 2020 · We report the crepuscular hunting behavior by the Besra Accipiter virgatus, on the Glossy Swiftlets Collocalia esculenta affinis and the Edible-nest Swiftlets.Missing: daily routine
[16]
(PDF) The Diet of Besra Sparrowhawk (Accipiter virgatus) in ...
Aug 5, 2025 · dimorphism in the Besra Sparrowhawk is distinct, with the female much larger than the male. Both sexes have a particularly long middle digit, ...
[17]
[PDF] Notes on the breeding of Besra Tachyspiza virgata from South Gujarat
Jun 18, 2025 · Our findings reinforce the ecological value of the moist deciduous forests of South Gujarat as essential breeding habitats for forest raptors ...<|control11|><|separator|>
[18]
[PDF] Current Status and Conservation of Falconiformes in Tropical Asia
Most wintering migrants (20) are nonforest species. There is evidence of largescale population declines on the continent of Asia, as well as insular syndrome.<|control11|><|separator|>
[19]
Bird checklists - Namdapha Tiger Reserve - Avibase
Large Hawk Cuckoo, Hierococcyx sparverioides. Common Hawk Cuckoo, Hierococcyx ... Besra, Accipiter virgatus. Eurasian Sparrowhawk, Accipiter nisus. Northern ...
[20]
Besra Tachyspiza virgata - eBird
A medium-sized Accipiter of forested areas. Adult grayish brown above with a grayer head and neck, pale underparts with orange barring and blotches.
[21]
**Besra** (Accipiter virgatus) Bukidnon June 2022 - Facebook
Jul 8, 2022 · ... plumage that varies in tones in different parts of its range. All birds have a bi-colored bill with a curve to the tip of the upper bill ...Missing: Handbook | Show results with:Handbook
[22]
[PDF] THE WILD LIFE (PROTECTION) ACT, 1972 (Last Updated 1-4-2023)
Procedure to be followed by the Board. 8. Duties of State Board for Wild Life. CHAPTER III. HUNTING OF WILD ANIMALS. 9. Prohibition of hunting.
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Article 21: The hunting or killing of wildlife under national key protection is prohibited. Where it is necessary to hunt wildlife under level-1 national ...Missing: Besra | Show results with:Besra