The male goldfinch, easily recognized in the summer by its yellow body and black wings, loses much of its brilliance during the cold seasons when it turns light brown and looks like the female. Goldfinches are thick-billed, unstreaked birds. They fly in an undulating (wavy, up and down) manner. Goldfinches can be found in Wisconsin throughout the year, but during the winter they're not as common in the north.
Goldfinches like thistle seeds, hulled sunflower seeds, and oil-type sunflower seeds.