Hamsters are small, nocturnal rodents belonging to the family Cricetidae. They are popular pets due to their friendly nature and manageable size, typically measuring 5 to 7 inches long. There are several species of hamsters, including the Syrian hamster, which is the most common pet variety, and the Dwarf hamster, known for its smaller size and social behavior. These animals are known for their cheek pouches, which they use to store food and transport it back to their burrows. Hamsters are generally solitary creatures, preferring to live alone, except for some species that can coexist in pairs. They require a suitable habitat, including a cage with bedding, exercise wheels, and toys to keep them active and healthy.