Ashy woodswallow

Ashy woodswallow
At Buxa Tiger Reserve, India
Conservation status

Least Concern  (IUCN 3.1)[1]
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Artamidae
Genus: Artamus
Species: A. fuscus
Binomial name
Artamus fuscus
Vieillot, 1817

The ashy woodswallow (Artamus fuscus) sometimes also called the ashy swallow-shrike is a woodswallow which is found in south Asia. Like other woodswallows, it has a short curve bill and a short square tail and long wings. It is usually seen perched in groups, high on powerlines, tall bare trees and most often in areas with a predominance of tall palm trees.

Description

In flight, the broad base to the wings gives it a very triangular outline (Hyderabad, India)

This stocky woodswallow has an ashy grey upperparts with a darker head and a narrow pale band on the rump. The underside is pinkish grey and the short slaty black tail is tipped in white. The finch-like bill is silvery. In flight the long wing looks very broad at the base giving it a very triangular outline. The first primary is very short. The legs are short and the birds usually perch on high vantage points from which they make aerial sallies. There are no geographic variations in plumage and no subspecies have been designated.[2][3]

Males and females are indistinguishable in the field, however an old report suggests that the sexes differ in the colour of the inside of the mouth.[4] Young birds appear barred on the underside.[3]

Habitat and distribution

Preening (Buxa Tiger Reserve, India)

Woodswallows are found in a range of habitats from the plains to about 2000 m, over cultivated areas, in forest clearings and often in areas with tall palm trees. The species is widely distributed across India, Nepal, Sri Lanka, Thailand, Burma, Laos, Malaysia and China. They are absent in the very arid regions of western India.[3][5] They have been recorded on the island of Maldives.[6]

Behaviour and ecology

Measurements
Indian specimens[3]
Length 190 mm (7.5 in)
Culmen 21–24 mm (0.8–0.9 in)
21–23 mm (0.8–0.9 in)
Wing 129–138 mm (5.1–5.4 in)
130–139 mm (5.1–5.5 in)
Tail 54–60 mm (2.1–2.4 in)
48–58 mm (1.9–2.3 in)
Tarsus 16–19 mm (0.6–0.7 in)
Weight 37–42 g (1.3–1.5 oz)

Ashy woodswallows are usually seen in small groups. Several birds may sit huddled side-by-side on the bare branches of a tall tree or on high vantage points such as powerlines and pylons. From their perches, they make aerial sallies, flapping and gliding to capture insects in the air. Insects may be caught in the beak, transferred and held in their feet, torn up with their bill and swallowed without returning to the perch. They may also return to the perch with prey to feed and will sometimes sit on the ground and have been known to visit bird baths.[7][8] Although mainly feeding on insects, they may take nectar from flowers of trees such as Erythrina. They have been recorded feeding on toxic butterflies of the family Danaiidae such as Euploea core which are avoided by other birds.[3]

Calls

The breeding season in India is March to June, the nest is a shallow cup placed at some height such as at the base of the frond of a tall palm or a hollow atop a street lighting post. The usual clutch consists of 2–3 greenish white eggs with brown spots. Both parents take part in nest building, incubation and feeding the young. They will mob larger birds such as crows and birds of prey that approach too close to the nesting birds.[3][9] The song consists of a varied combination of wheezy notes that may include imitations of the calls of other birds. The usual call is shrill nasal chewk.[2][3]

They make seasonal movements, possibly in response to rainfall.[10]

Ashy woodswallows huddling (Kumbla)

The woodswallows, Artamidae, are among the few perching birds that have special feathers called powder down that break up into fine dust that is spread by the birds onto their body when preening.[11] Powder down is also found in the egrets. Members of the family have a brush-tipped tongue. They also have some of the thoracic vertebrae fused into a structure called the notarium.[12]

A species of ectoparasitic birdlouse, Menacanthus elbeli, and a mite that lives inside the feather quill have been described from hosts of this species. Other organisms associated with the species include endoparasitic trematodes Plagiorchis dactylopharynx, Papillatrema echinata and Stomylotrema travassosi.[13]

References

  1. ↑ BirdLife International (2012). "Artamus fuscus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ 2.0 2.1 Rasmussen, PC & JC Anderton (2005). Birds of South Asia. The Ripley Guide. Volume 2. Washington DC & Barcelona: Smithsonian Institution and Lynx Edicions. p. 593.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Ali, S & SD Ripley. Handbook of the Birds of India and Pakistan. Volume 5 (2 ed.). New Delhi: Oxford University Press. pp. 143–145.
  4. ↑ Legge, WV (1880). A History of the Birds of Ceylon. Volume 2. pp. 665–669.
  5. ↑ Stonor, CR (1946). "The Ashy Swallow-Shrike (Artamus fuscus) in the Nilgiris". J. Bombay Nat. Hist. Soc. (184) 46 (1).
  6. ↑ Anderson, RC (2007). "New records of birds from the Maldives" (PDF). Forktail 23: 135–144.
  7. ↑ Inglis, CM (1951). "The Ashy Swallow-Shrike (Artamus fuscus Vieillot) at a bird bath". J. Bombay Nat. Hist. Soc. 50 (1): 174.
  8. ↑ Santharam, V (1981). "Some interesting observations: Ashy Swallow-Shrike (Artamus fuscus) on the ground". Newsletter for Birdwatchers 21 (9–10): 13–14.
  9. ↑ Santharam, V (1984). "A novel nest of the Ashy Swallow-Shrike". Newsletter for Birdwatchers 24 (7–8): 8–9.
  10. ↑ Thyagaraju, AS (1933). "A note on the migration of the Swallow-Shrike Artamus fuscus (Vieil)". J. Bombay Nat. Hist. Soc. 36 (4): 996.
  11. ↑ Lowery Jr., GH & JP O'Neill (1966). "A new genus and species of Cotinga from eastern Peru" (PDF). The Auk 83 (1): 1–9. doi:10.2307/4082975.
  12. ↑ James, HF (2009). "Repeated Evolution of Fused Thoracic Vertebrae in Songbirds" (PDF). The Auk 126 (4): 862–872. doi:10.1525/auk.2009.08194.
  13. ↑ Skoracki, Maciej (2004). "A review of quill mites of the genus Syringophiloidus Kethley, 1970 parasitizing quills of passeriform birds, with descriptions of four new species (Acari: Prostigmata: Syringophilidae)" (PDF). Genus 15 (2): 281–300.