And you don’t have to be an accomplished photographer to participate. If you photograph birds on any level you’re likely to eventually get some photos that would be helpful.
Cornell’s Birds of North America Online calls Mountain Bluebirds one of the most sublime songbirds in North America and I agree. The cerulean blue of the male is simply spectacular and females and juveniles show some of it too.
Raptors in particular are known for repeatedly using the same perch, sometimes over a period of years. And sometimes they’re used by more than one raptor species so it behooves the bird photographer to check them out regularly. If raptors like’m, I like’m – even when they’re less than photogenic.