Scientists have so far identified more than 700 specimens, including the skull of a prehistoric American lion and the bones of dire wolves, saber-tooth cats, ground sloths and bison.

• 科学家已经识别了700多种样本，其中包括史前美洲豹的颅骨，惧狼、剑齿虎、大地獭和野牛的骨化石。