Pine Siskins - green-morphs (upper two birds, front and rear) with typically plumaged birds, Gill, Franklin Co., MA. December 9th, 2010. Green-morphs show unusual amounts of yellow in various parts of the plumage but especially on the undertail coverts which should be white in typical birds. The green-morph at the front also had a nice greenish suffusion to the upperparts and yellowish-toned supercilia and surround to the ear coverts. Nice birds, sometimes causing confusion with female Eurasian Siskin.
Pine Siskins - Gill, Franklin Co., MA. December 9th, 2010. Slightly pale, but fairly typical bird in most respects.
What a treat to get a sudden incursion of Pine Siskins at the feeders this morning. After days with just one lone siskin working the thistle-socks with the goldfinches, a sudden mass arrival of about 30 birds included at least two 'green-morphs' - a scarce color variant with abnormal amounts of yellow in the plumage.