Authored by Phil Doerr
In winter, American Goldfinch females and males really look alike, as males drop the very distinctive black wing feathers and brilliant yellow body plumages. By now (February) males have molted and replaced the bright yellow body feathers of late August w/ the drab plumage that will see them through winter. Females do the same but it’s not so noticeable! It’s a definite advantage to be less visible to predators as the birds forage leafless treetops and fields in groups of a dozen or more. Some winters when we have “finch years” goldfinches may be seen in tree tops or at feeders, in the company of a hoard of pine siskins. Siskins are by comparison a bit smaller, and with some yellow wing and tail feathers that contrast with a streaky brown head and body.
Goldfinches (and other finches) that regularly visit our thistle seed and sunflower feeders in winter are known from banding studies to make the rounds of available feeder stations within a 4-mile radius. This behavior seems to decrease the likelihood that the birds will encounter an empty feeder! This semi-nomadic behavior also keeps the birds moving about in more natural agricultural and woodlot areas with seed producing grasses, forbs, wildflowers and a variety of “weeds”. In flight, groups can be heard vocalizing their “potato chip” call. Keep an eye out for these wonderful winter wanderers and see if you tell the males from the females at winter feeders.
Cautionary… There’s a downside to the observed finch behavior we’ll consider next month
Thanks for caring for the birds, they do tell us to “Act on Climate!” Spread the word!