Small, plain olive Old World warbler. Note long buffy eyebrow and dark eyeline.
Small, plain Old World warbler with a long buffy eyeline. Some individuals are browner than others.
Small, drab warbler with a small bill and long buffy eyebrow. Upperparts vary from olive to brown.
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A small, compact songbird with a thin, short bill, long wings, and medium-length tail. Physically similar to American warblers (also known as "wood-warblers").
Slightly larger than a Wilson’s Warbler, slightly smaller than a Blackpoll Warbler.
sparrow-sized or smallerAll Alaskan breeders are designated as subspecies kennicotti. Alaskan birds have more grayish (less brownish) olive tones above and are more yellowish below than Eurasian birds (borealis), which also have longer, heavier bills and slightly longer wings than Alaskan birds.
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