Broad-tailed grassbird

Broad-tailed grassbird
Conservation status
Scientific classification
Kingdom: Animalia
Phylum: Chordata
Class: Aves
Order: Passeriformes
Family: Locustellidae
Genus: Schoenicola
Species: S. platyurus
Binomial name
Schoenicola platyurus
Jerdon, 1844
Synonyms

Timalia platyura

The broad-tailed grassbird (Schoenicola platyurus) is a species of Old World warbler in the Locustellidae family. It is endemic to the Western Ghats of India with the possibility of occurrence in Sri Lanka. A small, mostly brown bird, it has a broad rounded and graduated tail. It is found only on the higher altitude grassy hills where it usually skulks, except during the breeding season when males fly up into the air to sing in their display. The species is believed to be a resident although it is possible that they make local movements.

Description

The uniform brown upperparts, broad and long graduated tail of the bird is distinctive. The species has a buff supercilium and the brown tail has thin dark bars. The underside of the tail is very dark and the feathers are tipped with white. Males and females are indistinguishable in plumage. The call of the male during breeding is a lark-like and repeated trill that is accompanied by fanned tail and a fluttering flight. Other calls include a chack and a zink note. The gape colour is black and visible in singing males but is brown in females.[2][3][4] In the non-breeding season, it is a skulker moving rapidly between grass and reeds but sometimes perches in the open.[5][6][7]

Taxonomy and systematics

Head showing the short bill and the two rictal bristles

The species has in former times included the African Schoenicola brevirostris which was originally called Catriscus apicalis and later as Schoenicola platyura brevirostris. The Indian species was first described by Jerdon who found the bird at the base of the Gudalur ghat at the foothills of the Nilgiris.[8] The bill is short strong and culmen is slightly curved in the genus and there are two rictal bristles. The tarsus is somewhat long for the proportions. The populations north and south of the Palghat gap are said to differ in plumage shade, the northern form being larger and paler and greyer above with the flanks sandy-brown. The southern form is dark rufous brown above and more whitish below with bright buff on the breast and flanks. This plumage variation was earlier believed to be seasonal.[3][9][10][11] Molecular phylogeny studies place the genus in the warbler subfamily Megalurinae (along with Megalurus, Chaetornis and Graminicola).[12][13][14]

Distribution

The species is restricted to grassy moist highlands, principally in the Western Ghats of southern India mainly south of Karnataka but with some records from Lonavla and Nasik.[15] A specimen was collected by S. A. Hussain at Point Calimere that suggests that the bird may be involved in local movements or migrations possibly into Sri Lanka.[16] Suggestions that it may occur in Sri Lanka are as yet not well supported, there is an old specimen (collected by H. Cumming who has been considered unreliable[10] and doubtfully identified by Colonel Legge[2]) and two unconfirmed sight records from Gammaduwa, Matale Hills and Waitalawa, Rangala Hills.[6][17] The species has not been reported from the Biligirirangan Hills.[18]

Behaviour and ecology

The breeding season appears to be March to May but nests have been seen in July and September and the bird is suspected to raise two broods. The nest is a ball of coarse grass blades with an entrance on the side and placed low in a tussock of long grass. The eggs are white with spot and blotches of brownish red. The usual clutch is about 2 or 3 eggs. It feeds on insects.[2][17][19]

References

  1. ↑ BirdLife International (2012). "Schoenicola platyurus". IUCN Red List of Threatened Species. Version 2013.2. International Union for Conservation of Nature. Retrieved 26 November 2013.
  2. ↑ 2.0 2.1 2.2 Hume, AO (1880). "Schoenicola platyurus". Stray Feathers 9: 260–264.
  3. ↑ 3.0 3.1 Oates, EW (1889). The Fauna of British India, Including Ceylon and Burma. Birds 1. Taylor and Francis, London. pp. 384–385.
  4. ↑ Raman ,T. R. S. (1998). "Observations on the vocalizations and display of the Broadtailed Grass Warbler (Schoenicola platyura) (Jerdon)". Newsletter for Birdwatchers 38 (1): 6.
  5. ↑ Brooks, WE (1880). "A few remarks on Schoenicola platyura". Stray Feathers 9: 209–212.
  6. ↑ 6.0 6.1 Collar, NJ; AV Andreev, S Chan, MJ Crosby, S Subramanya and JA Tobias, ed. (2001). Threatened Birds of Asia. BirdLife International. pp. 2195–2199.
  7. ↑ Sharpe, RB (1883). Catalogue of the birds in the British Museum. Volume 7. Cichlomorphae Part 4. Timeliidae. British Museum. p. 110.
  8. ↑ Jerdon TC (1863). The birds of India. Volume 2 part 1. The Military Orphan Press, Calcutta. p. 73.
  9. ↑ Baker, ECS (1924). The Fauna of British India, Including Ceylon and Burma. Birds 2 (2 ed.). Taylor and Francis, London. pp. 437–438.
  10. ↑ 10.0 10.1 Rasmussen PC & JC Anderton (2005). Birds of South Asia: The Ripley Guide. Volume 2. Smithsonian Institution & Lynx Edicions. p. 516.
  11. ↑ Sharpe,R Bowdler (1882). "A note on the genera Schoenicola and Catriscus [Reprinted from the Proceedings of the Zoological Society of London, 1881]". Stray Feathers 10 (4): 254–256.
  12. ↑ Alström, Per et al. (Feb 2006). "Phylogeny and classification of the avian superfamily Sylvioidea". Molecular Phylogenetics and Evolution 38 (2): 381–397. doi:10.1016/j.ympev.2005.05.015. ISSN 1055-7903. PMID 16054402.
  13. ↑ Beresford, P., Barker, F.K., Ryan, P.G., Crowe, T.M. (2005). "African endemics span the tree of songbirds (Passeri): molecular systematics of several evolutionary ‘enigmas’". Proceedings of the Royal Society B 272 (1565): 849–858. doi:10.1098/rspb.2004.2997. PMC 1599865. PMID 15888418.
  14. ↑ Drovetski, S. V., Zink, R. M., Fadeev I. V., Nesterov, E. V., Koblik E. A., Red’kin, Y. A. and Rohwer, S. (2004). "Mitochondrial phylogeny of Locustella and related genera". J. Avian Biol. 35: 105–110. doi:10.1111/j.0908-8857.2004.03217.x.
  15. ↑ Raha, B. Sarda, R. Mistry, V.K. (2007). "Broad-tailed Grass-warbler Schoenicola platyura in Nashik, Maharashtra". J. Bombay Nat. Hist. Soc. 104 (1): 93.
  16. ↑ Hussain,SA (1976). "Occurrence of the Broadtailed Grass Warbler Schoenicola platyura (Jerdon)] on the Coromandel coast". J. Bombay Nat. Hist. Soc. 73 (2): 400–401.
  17. ↑ 17.0 17.1 Ali, S & S D Ripley (1997). Handbook of the birds of India and Pakistan 8 (2 ed.). Oxford University Press. pp. 91–92. ISBN 0-19-562063-1.
  18. ↑ Srinivasan, U. & Prashanth, N.S. (2006). "Preferential routes of bird dispersal to the Western Ghats in India: An explanation for the avifaunal peculiarities of the Biligirirangan Hills". Indian Birds 2 (4): 114–119.
  19. ↑ Hume, AO (1889). The nests and eggs of Indian birds 1 (2 ed.). R H Porter. pp. 251–252.

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