Like a slightly larger, longer-billed version of the Purple Finch, Cassin’s Finch is a resident of mountains and conifer forests of the West. It is sometimes found at very high elevations, in the scrubby forest just below treeline, especially in late summer. At other times, little roving flocks wander through the woods, often feeding on buds and seeds high in the trees. The complicated song of the male often includes brief imitations of other birds.
~Audubon Field Guide~