Armadillos possess the teeth typical of all sloths and anteaters. Ground sloths are the ancient relatives of modern tree sloths, armadillos, and anteaters. There are 31 living species&colon; the anteaters, tree sloths, and armadillos. They hunted by ambushing animals like deer, camels, ground sloths, bison, and young mammoths. Two dedicate themselves to armadillos, one to sloths, and another prefers only cattle. These bands of newcomers encountered mammoths, camels, ground sloths, and horses. They used corpses from morgues, or the heads of monkeys or sloths. All other mammals have seven cervical vertebrae, other than the two-toed and three-toed sloths. The three-toed sloths are arboreal neotropical mammals (also known as "three-fingered" sloths). Examples include many different genera of ground and arboreal sloths across all islands. Algae that grow on the backs of turtles or sloths are considered as commensals, too. The reproduction of pygmy three-toed sloths is unknown. There are a large number of arthropods associated with sloths. Extinct xenarthrans are the glyptodonts and the ground sloths. Examples may be found in the arthropods associated with sloths.