From the Annals of the Extinct – In 2000, part of what is now the Waco Mammoth National Monument opened. The WMNM is at a site where a herd of mammoths were trapped during a flood about 68,000 years ago. The area contains the remains of 24 Columbian Mammoths, along with the remains of associated animals of the late Pleistocene, including Western Camel (Camelops hesternus), saber-toothed cat (Homotherium), dwarf antelope (cf. Capromeryx), American Alligator (Alligator mississippiensis), and giant tortoise (Hesperotestudo). The site contain the Nation’s only recorded discovery of a nursery herd (females and offspring) of Pleistocene mammoths, comprising at least 18 of the unearthed mammoths.