One of the most commonly found hamsters today(Besides the Syrian) is the Campbell Russian Dwarf Hamster. Most people refer to them as Dwarf(Or Siberian) Hamsters, although there are other species, they are not commonly found, though the Winter White Dwarf Hamster is becoming a bit more common.

Campbell Dwarfs were first discovered in Moscow in the year of 1905, but they were not widely kept as pets until the 1980s. Over the years more colors have been developed and you can find a variety of colors, including Agouti, Black, Blues, Albinos, Chocolates, and more.

Campbells are approximately 10-12cm when full grown, males usually a bit bigger than females. The average life span is around 2 years, though they may live longer depending upon care given. They have a expandable cheek pouches and a plump, round body. They are sociable creatures and will live happily within a group if introduced at a young age. Adults are harder to introduce, especially females, though I have been successful introducing adults using the split-cage method. Most adult males can be put with younger(and most of the times, smaller) females and it will be very successful. As long as the female is not the one doing the aggressing, they should work it out nicely.

The most suitable cages for Dwarf Hamsters are those made for mice, such as plastic or glass aquariums, large critter keepers, etc. Due to their small size Dwarf Hamsters can squeeze through most wire cages and if a Dwarf Hamster has babies there is a good chance a baby could fall through the wire, not being able to get back to its mother or vice versa and will surely die, so aquariums are more highly recommended.