Other species, such as the Russian dwarf, naturally live in teams. There are 24 species of Hamster they usually belong to the family Cricetidae. The Syrian, Russian Dwarf Campbell and Roborovski breeds are the most popular for pets. When comparing a hamster vs. a mouse, hamsters are typically bigger than mice. In addition, hamsters usually are present in a higher diversity of colors than mice. Mice are additionally more opportunistic eaters while hamsters are recognized to hoard food and even store it in their mouths.