Saturday, March 03, 2007

American Goldfinch changing

This American Goldfinch male at the thistle seed feeder today shows early signs of the dramatic spring molt that this species is known for, changing from the relatively drab winter plumage to the striking yellow they wear during the breeding season. Now I'm wondering -- is this change a result of feather wear, or of actual new feathers growing in? Another topic for some research.


Post a Comment

<< Home