Luì dell'erba dalla coda larga

Identificazione

The uniform brown upperparts with a broad, round-tipped and long graduated tail are distinctive features of this bird. 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. In the non-breeding season, it is a skulker moving rapidly between grass and reeds but sometimes perching in the open.

Tassonomia

The species has in former times included the African Schoenicola brevirostris, which was originally called Catriscus apicalis and later Schoenicola platyura brevirostris. The Indian species was first described by Jerdon who found the bird at the base of the Gudalur ghat in the foothills of the Nilgiris. The bill is short and strong with the culmen slightly curved, 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, 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. Molecular phylogeny studies place the genus in the warbler subfamily Megalurinae (along with Megalurus, Chaetornis and Graminicola). A study of the group shows that the African S. brevirostris and S. platyurus are not closely related and that S. platyurus is a sister of Chaetornis striata.

Nome scientifico

Schoenicola platyurus

Autorità

(Jerdon, 1841)

Ordine

Passeriformi

Famiglia

Locustellidae

Genere

Schoenicola

Areale e habitat

The broad-tailed grassbird is restricted to grassy moist highlands, principally in the Western Ghats of southern India mainly south of Karnataka but with some records from Pune, Lonavala and Nasik. 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. 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, and doubtfully identified by Colonel Legge) and two unconfirmed sight records from Gammaduwa, Matale Hills, and Waitalawa, Rangala Hills. The species has not been reported from the Biligirirangan Hills.

Migrazione

Resident species

Comportamento

The breeding season appears to be from March to May, but nests have been seen in July and September, so the raising of two broods is suspected. 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 spots and blotches of brownish red. The usual clutch is 2 or 3 eggs. It feeds on insects.

Conservazione

Tendenza della popolazione

declining