Supplementary info on Purple Finch

Female-plumaged Eastern Purple Finch (left) and Pacific Purple Finch (right) showing differences in back and rump pattern. Specimen use granted by Museum of Comparative Zoology, Harvard University ©President and Fellows of Harvard College.

Adult male Eastern Purple Finch (two on left) and Pacific Purple Finch (two on right) showing differences in wing covert pattern. Specimen use granted by Museum of Comparative Zoology, Harvard University ©President and Fellows of Harvard College.

From left to right: two Eastern Purple Finches, two Pacific Purple Finches, two Cassin's Finches. Specimen use granted by Museum of Comparative Zoology, Harvard University ©President and Fellows of Harvard College.

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