When distinguishing a female or immature Mourning Warbler from a Common Yellowthroat, what is the key difference regarding the underparts color?
Answer
The Mourning Warbler is yellow below, while the Common Yellowthroat has a white belly
A decisive way to separate confusing female or immature plumages is to check the lower belly; the Mourning Warbler maintains yellow underparts, whereas the Common Yellowthroat exhibits a white belly.
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