Images by Emily Willoughby (top left), Matthew Martyniuk (bottom left), and John Conway (at right).

Several of the diagrams here are from my review of bird diversity and evolution (Naish 2012). For Tet Zoo articles on various of the subjects illustrated here, see...

Ref - -

Naish, D. 2012. Birds. In Brett-Surman, M. K., Holtz, T. R. & Farlow, J. O. (eds) The Complete Dinosaur (Second Edition). Indiana University Press (Bloomington & Indianapolis), pp. 379-423.