The hamster kept as pet most often is the Golden Hamster, also called Syrian Hamster. So-called Teddybear or Black Bear hamsters are also breeds of golden hamsters.
But also four species of smaller hamsters are popular pets, often called dwarf hamsters. These are Roborovski hamster, (Phodopus roborovskii) often called Roborovski, the chinese striped hamster (Cricetulus griseus) and the two subspecies of Phodopus sungorus, the winter white russian dwarf hamster (Phodopus sungorus sungorus) and Campbell's dwarf hamster (Phodopus sungorus campellii).
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