“Seemingly similar birds can be really different from each ... A female house finch has a fairly plain brown face, while a female purple finch has a contrasting white eyebrow and whisker mark.

Female Cassin’s finches show bold streaks ... and their bills are longer and more acutely pointed than those of either purple ...

Identifying the male and female house from other Carpodacus finches requires care. The male house differs from the male purple finch not only by having a smaller, more curved bill, but also by ...