Henderson Reed Warbler

The Henderson reed warbler is a large, short-billed warbler, with an average length of 17 cm (6.7 in). Males weigh 22.5–30.5 g (0.79–1.08 oz) on average and females weigh 21–25 g (0.74–0.88 oz) on average. The head is white, with a blotched olive-brown and white crown and a dark eyestripe. The upperparts are olive-brown, while the underparts are white with a light yellow wash. The wing feathers have pale borders, and some wing feathers can be entirely white. The distribution and extent of leucistic patches on the body is variable and some birds can be almost entirely white. Voice: The warbler's calls include a monotonous chirp, a short (<0.13 s) high-pitched note (4–8 kHz), and a series of thin notes and chirps one to five seconds long. The last of these sounds similar to a song, but it is not known if this species sings.