Krider´s & Harlan´s Red-tailed Hawk

[JanJ]

You might want to update your knowledge on the identification of these (by Liguori & Sullivan)
From the recent issue of Birding magazine.

http://www.aba.org/birding/v42n2p30.pdf

http://www.aba.org/birding/v42n2p38.pdf

More photos:

http://www.aba.org/birding/v42n2p5w1.pdf

Good reading.

JanJ