Nothing particularly special here, just some notes I made trying to learn bird anatomy. They're directly referenced from the book Animal Drawing: Anatomy and Action for Artists
by Charles R. Knight, which is a very good reference book. ^^ I basically put all the stuff I'm working on learning onto one page for easy reference. Thought I'd post it, it may be helpful to someone. All credit goes to the author/illustrator of that book though. I just copied to learn.
It never occurred to me, but if anyone would like to use this in a photomanipulation go ahead. ^^ Just be sure to let me know about it. Here's one it was used in: