Syrian Hamsters were first domesticated in 1930, although the Syrian was presented as a new species in 1839. They are native to the deserts of Syria. A member of the rodent family, the "Golden" Hamster (Mesocricetus Auratus) is about 7 in. long when fully grown. Dwarf hamsters are native to the wilds of Mongolia. Belonging to the rodent family, the Campbell's Russian Dwarf Hamster (Phodopus campbelli) is about 8 cm. long when fully grown. Other hamster species sometimes offered as pets include Chinese hamsters and Dwarf Winter White hamsters (Phodopus sungoris).