The red breast is clearly demarcated from a whitish ... pink overall and lacks distinct streaking on its belly. The female finches are more problematic. The female house has a very plain face ...

A female house finch has a fairly plain brown ... Kenn and Kimberly Kaufman write, "Little red finches can be tricky. Purple finches and house finches are similar in appearance, as males of ...

Common and hoary redpolls are 2 closely related finches of the boreal forest ... the paler rump has distinctive streaking. Breeding female: she lacks the red breast of the male and has variable ...

The paper M. Gazda et al., “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 bellies and ...