However, bird embryos actually start out like dinosaurs, and then develop their adult anatomy (centre). (sciencedaily.com)
Unlike other animals, the calcaneum in bird embryos presses against the lower end of the fibula: They are so close they have even been confused with a single element by some researchers. (sciencedaily.com)
To explore the roles of these genes, Bhullar and Abzhanov treated bird embryos with inhibitors of the WNT and Fgf8 proteins. (sciencemag.org)