A horse skull found in Gypsum Cave in mountains east of Las Vegas in 1930, was so well preserved, it was thought to be a modern horse or burro. It sat tucked away on a museum shelf overlooked until recently. It turned out to be 13,000 years old and scientifically significant: the most complete skull ever found of a “New World stilt-legged horse.” Eric Scott, an ice age horse expert at California State University, San Bernardino.