The American goldfinch (Spinus tristis) is a small songbird native to North America. It is easily recognized by its bright yellow plumage in males during the breeding season, while females and non-breeding males are more muted in color, featuring olive-brown feathers. These birds are known for their cheerful, twittering songs and are often seen flitting about in open fields and gardens. American goldfinches primarily feed on seeds, particularly those from sunflowers and thistles. They are social birds, often found in flocks, and they build their nests in shrubs or trees. Their unique breeding cycle allows them to time their nesting with the peak availability of seeds in late summer.