Look for a small yellow bird with black wings ... Females are less colorful year-round. The female American goldfinch is duller yellow with patches of drab olive and white wing bars.

Male: the breast, rump, and front of the head are typically red, but the color can vary to orange or occasionally yellow ... the male and female house from other Carpodacus finches requires ...

“A genetic mechanism for sexual dichromatism in birds,” Science, 368:1270–74, 2020. Male red siskins (Spinus cucullatus), a species of finch, flaunt orange-red ... encodes an enzyme that helps convert ...

Juvenile: resembles adult female. Unstreaked. The male is unlike any other finch in North America; the Wilson’s warbler is the only other bright yellow species with a black cap, but it does not ...