American Goldfinches are year round residents in New England, but are not easily seen until the summer when the male take on a brilliant yellow color. These birds are fairly common and will happily come to feeders filled with thistle (nyjer) seed.
A curious thing about this species is it’s flight pattern: an undulating line that looks like they are purposely making a wave pattern. They often make a call while flying that sounds a bit like “per-chic-o-ree”. See if you can spot an American Goldfinch flying through the zoo!