Chestnut-sided Warbler Identification Tips
(Credit: U. S. Geological Survey)
General Information
- Small, active, insect-eating bird
- Yellow wing bars
- Thin, pointed bill
- Black legs

Adult male alternate
- Yellow crown
- White patch on side of neck surrounded by thick black
  eyeline and black malar streak
- Black malar streak connects with thick rusty stripe on
- White underparts
- Black back with white streaks
- Female in alternate plumage similar to male but duller
  with reduced rust on sides

Basic and immature
- Green crown, nape and back
- Gray face and sides of breast
- White eye ring
- White belly and undertail coverts
- Some rust may be present on sides

Similar species
In alternate plumage, the only other warbler with rusty sides is the Bay-breasted Warbler but it has a brown, not yellow, crown and has a dark throat.

In basic (fall) and immature plumages the yellow wing bars can also be found in the Golden-winged Warbler but this species has a dark throat and cheek patch. The white eye ring, unstreaked underparts, and gray face are also good field marks.
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