We have lots of American Goldfinches. Their winter coat is quite a bit duller than their summer coat!
Here's some info from the Cornell Lab of Ornithology if you're interested:
"Goldfinches are among the strictest vegetarians in the bird world, selecting an entirely vegetable diet and only inadvertently swallowing an occasional insect. When Brown-headed Cowbirds lay eggs in an American Goldfinch nest, the cowbird egg may hatch but the nestling seldom survives longer than three days. The cowbird chick simply can’t survive on the all-seed diet that goldfinches feed their young."
