Grey-crowned Yellowthroat vs Swainson's Warbler

Grey-crowned Yellowthroat

Geothlypis poliocephala

Tiny15 gShrubland

The grey-crowned yellowthroat is about 14 cm (5.5 in) long and weighs about 13 to 16 g (0.46 to 0.56 oz). The species is sexually dimorphic. It has a long graduated tail and a stout bill with a visibly curved culmen. Adult males of the nominate subspecies G. p. poliocephala have a mostly olive-gray head with a gray crown, black lores, and white crescents above and below the eye. Their nape, upperparts, wings, and tail are grayish olive-brown. Their throat, breast, and undertail coverts are yellow, their flanks washed with buff, and their belly yellowish white. Voice: The grey-crowned yellowthroat's range-wide song is "a long rich series of varied and jumbled musical phrases". It also has some regional second songs, in Mexico "a series of rich rising and falling whistles" and in Costa Rica "a series of rapidly delivered clear whistled notes accelerating into descending trill".

ID text from Wikipedia, CC BY-SA 4.0

Photo: Arabella Willing · CC BY 4.0

Swainson's Warbler

Limnothlypis swainsonii

Small19 gShrubland

Swainson's warblers are a small and rather undistinguished songbird, though they are fairly large for a New World warbler. Adults grow to 12.5–16 cm (4.9–6.3 in) in length and 11–20.5 g (0.39–0.72 oz) in weight. The wingspan averages 23 cm (9.1 in). They are a plain olive-brown above and pale yellow-white below. They have a whitish eyebrow stripe that runs above their eye, and the top of their head is a rusty brown. Unlike most other New World warblers that are mostly dimorphic, there is no difference in appearance between a male or female Swainson's warbler.

ID text from Wikipedia, CC BY-SA 4.0

Photo: Jody Shugart · CC BY 4.0

Photos and recordings are credited to their authors under the licence shown. Full profiles: Grey-crowned Yellowthroat and Swainson's Warbler.