===Winter White Russian Dwarf Hamster ''(Phodopus Sungorus)''===
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*Currently not common in the UK but becoming more popular. These hamsters are also known as "Siberian Hamsters". Although they are very similar to Campbell hamsters, Winter White Russians are called "Winter White" because during winter they have a white coat. In summer their coat returns to that very similar to Campbell hamsters.
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*It should be noted that if the hamster is not subjected to changes in length of day i.e. by living indoors, the coat change may only be minor.