As often, the male is the brightly colored one: with the red head, on the right. The grey-striped female is on the left. House finches' native habitats are western US deserts, grassland, chaparral, and open woods. They have recently spread to bird feeders across the US. [Cornell Lab of Ornithology, AllAboutBirds.org] They have a nice song and an interesting call. Thanks to Gary Nielsen for the ID.