Date: 3/12/17 12:13 pm From: Cliff Otto <bye.bye.nh.birdy...> Subject: [NHBirds] Determining age of Great Gray Owls
There is a webpage that gives some good information on aging and variation of Great Gray Owls. It includes comparative photographs and talks about melanism and related things. One thing of note is:
To age them, a scope is essential. [But] If you are taking photos of perched birds to determine age, the best photos are of the sides and the back, showing the wingtips, secondaries, wing coverts and tail.