The American Goldfinches are the State bird of Washington, New Jersey and Iowa. They like to hang out with other Goldfinches except during breeding season. The Goldfinches are vegetarians; their diet is made up of mostly seeds.
Goldfinches will molts it body feathers in late summer and again in late winter. The word molt( when talking about bird feathers} means the process of removing their old feathers to make room for new feathers. In spring time they grow new body feathers and they grow a new set of feathers before the winter months.
They build their nests when thistle, milkweed, and other types of plants produced their fibrous seeds in June or July. The plants give the finches materials with which to build their nests and the plants also provide them with seeds to feed their young ones. The photo below was taken in March.