What key field marker helps separate the female Purple Finch from the often confusingly plain female House Finch?
Answer
A prominent, whitish stripe that runs over the eye (supercilium)
Female Purple Finches possess a distinct visual marker—a prominent, whitish stripe running over the eye, known as a supercilium—which aids in separating them from the female House Finch, who has a plainer face.
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