American goldfinches are generally seed eaters, and they are particularly fond of niger thistle seed, but they will also eat small insects when they are nesting. Learn more about the American goldfinch withhelpful information from an Audubon Society member in this free video on wild birds. Expert: Wayne R. Petersen Contact: Bio: Wayne R. Petersen is director of the Massachusetts Important Bird Areas (IBA) program at the Massachusetts Audubon Society. Filmmaker: Christian Munoz-Donoso