Lost to the outside world for a generation—and feared extinct—a small deer-like species with tiny fangs has been photographed tiptoeing through a dry lowland forest in southern Vietnam... The silver-backed chevrotain, also known as the Vietnamese mouse-deer, is about the size of a large rabbit, with a silver sheen on its rump. The creatures have tusk-like incisors, visible in the new photographs of the animals. Because chevrotains lack horns or antlers, and the fangs are especially long in males, scientists think the males use them to compete for territory and mates.