Smithsonian Institution
National Museum of Natural History: American Mammals: Utah Prairie Dog
The Utah prairie dog, extinct in more than 90 percent of its former range, is an endangered species protected by law. It now lives in a small area of southern Utah, between the ranges of Gunnison's prairie dog and the white-tailed...
Smithsonian Institution
National Museum of Natural History: American Mammals: American Bison
The American Bison's recovery from near extinction parallels what happened to the European Bison, Bison bonasus. Once abundant and widespread in northern latitudes, their decline in several countries since the 6th century has been...
Smithsonian Institution
National Museum of Natural History: American Mammals: White Eared Pocket Mouse
One subspecies of the White-eared Pocket Mouse may be extinct, and the other is extremely rare, consisting of isolated, relict populations near the western Mojave Desert in California. White-eared Pocket Mice are nocturnal and probably...
CK-12 Foundation
Ck 12: Biology: Microevolution Study Guide
A general overview over the evolution of one population or one species over a short period of time.
Globio
Glossopedia: Feathers
Birds have them, and so did some species of extinct dinosaurs. They're feathers. They come in different shapes and sizes, all colors, and they enable birds to fly. Lots of information can be found in this article.