FIG. 23.19 Dinosaurs and birds. A number of dinosaur fossils link birds phylogenetically to their closest living relatives, the crocodiles. The fossil at the bottom is Archaeopteryx. Data from C. Zimmer, 2009, The Tangled Bank, Greenwood Village, CO: Roberts and Company.
Data from C. Zimmer, 2009, The Tangled Bank, Greenwood Village, CO: Roberts and Company; (photo) Jason Edwards/Getty Images.