(via North American Bird Sketches
New England Sketchbook 2
Carolina Chickadees in Post Oak, drawn in my backyard in Norman, Oklahoma, USA. by Debby Kaspari
More Chris sketches. (orig text is great: Field journal example. This is a fabulous example of studying the anatomy of a bird, its posturing and personality.
Lots of simple bird sketches on this site.
Debby Kaspari bird sketch "Draw a Bird