Juvenile Wood Stork: Backward Knees? Nope; Those are Ankles!

http://skeletaldrawing.blogspot.com/2011/09/um-hey-scientific-american-bird-knees.html

http://www.mdavid.com.au/birds/birdknees.shtml

http://lansingwbu.blogspot.com/2009/09/why-would-birds-develop-backwards-knees.html