Sri Lanka frogmouth

Sri Lanka frogmouth
A pair of ssp. roonwali, with female on right
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Podargiformes
Family: Podargidae
Genus: Batrachostomus
Species: B. moniliger
Binomial name
Batrachostomus moniliger
Blyth, 1849

The Sri Lanka frogmouth, Sri Lankan frogmouth or Ceylon frogmouth (Batrachostomus moniliger) is a small frogmouth found in the Western Ghats of south India and Sri Lanka. Related to the nightjars, it is nocturnal and is found in forest habitats. The plumage coloration resembles that of dried leaves and the bird roosts quietly on branches, making it difficult to see. Each has a favourite roost that it uses regularly unless disturbed. It has a distinctive call that is usually heard at dawn and dusk. The sexes differ slightly in plumage.

Description

At Thattekad Bird Sanctuary

This bird reaches 23 centimetres (9.1 in) in length. Like all frogmouths, this species has a wide and hooked bill with slit-like nostrils and the large head with eyes facing forward to provide a wide field of binocular vision. Compared to others of its genus it has small wings, which are distinguished by the wing coverts ending in black spots tipped with white.[2] The male is gray-brown with fine barring and a spotted crown. Some males are browner and look more similar to females. The female is more rufous or chestnut brown. Indian female birds have very fine black speckles on the crown but Sri Lankan females may lack or may have reduced markings.[3] The bird also has short, stiff bristles in front of and surrounding the eyes. The Western Ghats population, ssp. roonwali (named after Mithan Lal Roonwal), looks very slightly different. The male has a brownish-gray wing mirror and yellowish spots on the undersides, compared to gray or white in the nominate Sri Lankan form. The female has a bright reddish-brown wing mirror and the wings are unspotted below.[4][5]

Habitat and distribution

This species is found in the Western Ghats of southwest India and Sri Lanka. Its habitat is tropical forest, usually with dense undergrowth.[6] It can sometimes be found in more disturbed habitats, including plantations.[7] Its presence may be overlooked due to its nocturnal behaviour and camouflage.[8]

Behaviour

A young bird (middle) with adult female to left and male to right (Thattekad Bird Sanctuary)

This frogmouth is rarely seen during the day except at roost sites or when flushed. It regularly uses the same roost spot for months.[9] When alarmed at its perch, it slowly moves its head, pointing its bill upward, and it can easily be mistaken for a jagged, broken branch. It relies on this crypsis and will often sit still a long time before making an escape.[10] It may open its mouth wide in a threat display.[9] Like its congeners, it feeds on insects, catching them in flight or gleaning them from the ground or tree branches.[3] It is sometimes mobbed at its day roost by small songbirds.[3] It is vocal at dusk, the call of the female being a loud, screechy "shkeerauuw" which drops in volume and ends is a series of hiccups. Another call is a series of rapid "skwar-skwar-skwar" which is produced by both male and female.[3]

The breeding season in southern India is January to April, and in Sri Lanka February to March. The nest is a small pad made of moss lined with down and covered on the outside with lichens and bark. The bird incubates a single white egg, covering the nest and holding the tail flush with the tree, taking on the outline of a lichen-covered snag. The male often broods during the day, while both parents share the duty during the night.[10][11] After the chick fledges, the male destroys the nest. The parents often use the same branch for multiple nestings.[12] The juvenile may stay with the parents for a couple of months, huddling between them at the roost.[9]

References

  1. ↑ BirdLife International (2012). "Batrachostomus moniliger". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ Marshall, JT (1978). Systematics of smaller Asian night birds based on voice. Ornithological Monographs 25 (PDF). American Ornithologists' Union. p. 28.
  3. 1 2 3 4 Rasmussen PC & Anderton, JC (2005). Birds of South Asia. The Ripley Guide. Volume 2. Washington DC & Barcelona: Smithsonian Institution and Lynx Edicions. pp. 249–250.
  4. ↑ Dutta BB (2009). "Studies of the Ceylone [sic] Frogmouth, Batrachostomus moniliger Blyth from India, with the description of a new sub-species from Western Ghats". Rec. Zool. Survey India. 109 (2): 79–85.
  5. ↑ Martens J & Bahr N (2011). "Documentation of new bird taxa, 5. Report for 2009" (PDF). Vogelwarte. 49: 85–104.
  6. ↑ Sugathan, R (1981). "A survey of the Ceylon Frogmouth (Batrachostomus moniliger) habitat in the Western Ghats of India". J. Bombay Nat. Hist. Soc. 78 (2): 309–316.
  7. ↑ Borges, Renee of the Bombay Natural History Society (1986). "On the occurrence of the Ceylon frogmouth (Batrachostomus moniliger) in north Kanara, Karnataka". 83 (1): 200.
  8. ↑ Kumara, H.N. Singh, M. (2006). "Ceylon Frogmouth Batrachostomus moniliger Blyth in the rainforests of the Western Ghats, Karnataka". J. Bombay Nat. Hist. Soc. 103 (1): 100.
  9. 1 2 3 Kannan, R (1994). "Notes on the status and ecology of the Ceylon Frogmouth (Batrachostomus moniliger Blyth) from the Anaimalai Hills of Tamil Nadu". J. Bombay Nat. Hist. Soc. 91 (3): 454–455.
  10. 1 2 Phillips, W. W. A. (1947). "A Note on the Nesting of the Ceylon Frogmouth, Batrachostomus moniliger Blyth". Ibis. 89 (3): 515–516. doi:10.1111/j.1474-919X.1947.tb04373.x.
  11. ↑ Ali, S & Ripley, S D (1983). Handbook of the Birds of India and Pakistan. Volume 4 (2nd ed.). New Delhi: Oxford University Press. pp. 1–3.
  12. ↑ Jayarathna, K D Thandula (2004). "Observations on a nest of Sri Lanka Frogmouth Batrachostomus moniliger" (PDF). Forktail. 20: 129–130.
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