Western Grasshopper Warbler

Locustella naevia (Boddaert, 1783)

2018-06-03 Gilevskaya grove, Tyumen.	© Luiza Mardonova

Description

Adult Grasshopper Warblers in spring and summer have olive-brownish upperparts with dark-brown core-streaks. Pale supersillium is slightly visible. Flight and tail feathers are dark-brownish. Outer webs of flight feathers have olive-brown edges, tail feathers sometimes are slightly barred and with pale tips. Underparts are pale-clay, whitish on throat and belly, sometimes with dark-brownish streaks on breast. Underwing coverts are pale-buff of whitish. In fresh autumn plumage the upperparts have deep olive tinge; underparts are yellow toned. Bill is dark-brown with pale low mandible; legs are pale, pink-yellowish; eyes are light-brown. Juveniles have yellow-olive tinged upperparts; underparts have slightly green-yellowish tone and sharp dark streaks on breast. Some individuals have streaks and yellowish tone on underparts even after the first spring moulting. Sizes: wing 54-61 mm. Weight: 9.7-15.3 grams.

References