Hamsters are rodents belonging to the subfamily Cricetinae. The subfamily contains about 18 species, classified in six or seven genera. Because they're easy to breed in captivity, hamsters are often used as lab animals and kept as pets in more economically developed countries. Recently hamsters have become established as popular small family pets. Hamsters are crepuscular. In the wild, they burrow underground in the daylight to avoid being caught by predators. They are most active around dusk… (More on Hamsters)