Bay-breasted Warbler
Setophaga castanea
The Bay-breasted Warbler is a rare migrant to Britain, typically seen during the autumn, with most sightings occurring on the eastern and southern coasts. It is a small, energetic bird that can be spotted in woodland edges and scrubby areas, often flitting between trees in search of insects.
Field Identification Guide
Use these features to identify Bay-breasted Warbler in the field.
The Bay-breasted Warbler can be identified by its distinctive bay-coloured breast, white wing bars, and a greyish-brown back with a subtle greenish tint. Its facial markings, including a pale yellow throat and a dark crown, also help to distinguish it from other warblers.
The Bay-breasted Warbler is smaller than a Starling, measuring around 11-12 cm in length, and is comparable in size to a Goldcrest or a Firecrest.
The male Bay-breasted Warbler has a distinctive bay-coloured breast, a greyish-brown back, and white wing bars, with a dark crown and a pale yellow throat, while in autumn, the breast colour may be more subdued, becoming a pale brownish-grey.
The female Bay-breasted Warbler is similar to the male, but with a paler, more subdued breast colour, and a generally more subdued overall plumage, making it slightly less conspicuous than the male.
The Bay-breasted Warbler's call is a sharp, high-pitched "chip" or "tzip" sound, often repeated in a series, while its song is a series of short, musical phrases, often described as a rapid, tinkling melody.
The Bay-breasted Warbler is an active, agile bird that forages for insects and spiders in trees and shrubs, often flying between branches with a rapid, darting motion, and can be seen hovering in front of leaves to catch prey.
The Bay-breasted Warbler can be confused with the Blackpoll Warbler, but can be distinguished by its bay-coloured breast, which is darker and more reddish-brown in the Blackpoll, and by its white wing bars, which are narrower and more yellowish in the Blackpoll.
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