- House Finches nest in a variety of deciduous and coniferous trees as well as on cactus and rock ledges.
- Searching for nest sites is a conspicuous behavior throughout the nesting season. Females appear to do most prospecting, but males follow closely and often re-examine each site searched by the female.
- House Finches feed their nestlings exclusively plant foods, a fairly rare occurrence in the bird world. Many birds that are vegetarians as adults still feed animal foods to keep their fast-growing young supplied with protein.