The class Aves constitutes, for 10 points, what winged and feathered group of vertebrate animals?
An influential DNA-DNA hybridization taxonomy of these animals lumps four ratite orders with Struthioniformes, and Alan Feduccia disputes their theropod origin. A sister group to the order Crocodilia, these animals have a keeled(*) sternum, behind which lies the syrinx. Bans on DDT were introduced to prevent eggshell thinning in this class of animals, and recent species in this class to have gone extinct include the Eskimo curlew, the Himalayan quail, and the passenger pigeon. The class Aves constitutes, for 10 points, what winged and feathered group of vertebrate animals?
An influential DNA-DNA hybridization taxonomy of these animals lumps four ratite orders with Struthioniformes, and Alan Feduccia disputes their theropod origin.
{Bird}s [or {Aves} before mentioned]