Lesser Goldfinch

Jabbering clouds of yellow, green, and black Lesser Goldfinches gather in scrubby oak, cottonwood, and willow habitats of the western U.S., or visit suburban yards for seeds and water. These finches primarily eat seeds of plants in the sunflower family, and they occur all the way south to the Peruvian Andes. Listen closely to their wheezy songs, which often include snippets from the songs of other birds.
Males are bright yellow below with a glossy black cap and white patches in the wings; their backs can be glossy black or dull green (particularly on the West Coast). They have a black tail with large, white corners. Females and immatures have olive backs, dull yellow underparts, and black wings marked by two whitish wingbars.
Lesser Goldfinches gather in groups of up to several hundred at a time. They feed on seeds and grains, both in weedy fields and at bird feeders. Their flocks mix with other seed-eating songbirds, especially at bird feeding stations.