American Pronghorn Social Adaptations and the Ghosts of Predators Past

Based on the behavior of American pronghorn antelope--which exhibit certain unexplainable "defense" characteristics--zoologist John A. Byers theorizes the animals' mystifying behaviors evolved in response to dangerous predators of their ancient past. Byers's provocative hypothesis suggests that other species' adaptations also are haunted by ghosts of predators past. 41 photos. 111 line drawings.