This bird seems to match what I have been able to find out about the relatively rare "green morph" of the Pine Siskin, which is apparently very similar to the female Eurasian Siskin. It was strikingly olive/green when compared to the remainder of the Pine Siskins feeding (there is one photo of these for comparison).
Any hints on telling the two apart, and which you think this is? The bird was photographed this morning, December 26 on a niger feeder in Benton, Maine.
Any hints on telling the two apart, and which you think this is? The bird was photographed this morning, December 26 on a niger feeder in Benton, Maine.