This captivating classic National Geographic film chronicles the ground-breaking fieldwork of Dian Fossey (1932-1985) and Birute Galdikas and the world-wide efforts of these dedicated scientists to better understand the mountain gorilla and elusive orangutan.

Three denizens of the American West, long considered to be "varmints": coyotes, rattlesnakes and mustangs, are profiled in this documentary special. And the true nature of this misunderstood creatures are revealed.