Roborovski hamster
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Roborovskis (Phodopus roborovski) are the smallest and fastest of all hamsters and are commonly kept as pets. Distinguishing characteristics of the Roborovskis are the white spots where their eyebrows would be, and the lack of a dorsal stripe commonly seen in dwarf hamsters. They live, on average, to three and a half years of age - the longest of any domestic hamster.

They are very curious, however easily startled and generally quite shy. They are social and when socialised from an early age, sleep together in one place. They are not usually recommended for families with children, due to their flighty and sensitive temperament. Also, they are not as affectionate as other, more robust breed of hamster. Roborovski hamsters do not like to be held or cuddled, and do not form trusting relationships with humans easily. As they grow to be roughly the size of an adult's thumb, they can easily squeeze through the bars of a standard hamster cage, and so careful consideration needs to be given to housing. Always ask pet shop owners or breeders what is the best ideal cage to use. Because of their size and speed, Roborovskis are best for people who prefer to observe rather than to play with their pet.

Because of their size and features, they can be comical pets when observed in social groups. If kept together in mixed sex pairs or groups Roborovski Hamsters usually start to breed in the spring following the year in which the female was born. Females often become sterile at around 24 months of age but males usually remain fertile for most of their life.

Roborovski hamsters gestate for around 23-30 days. When the young are born they resemble pink beans. At around 5-6 days the skin may start to pigment and at 6-8 days hair begins to emerge. By 10-12 days the babies are covered in short fur and the eyelids are beginning to mature. At this time the babies may also start wandering around the cage, even though still blind. The female will usually collect the wandering babies and return them to the nest - this may be accompanied by squealing from the babies but is not usually anything to worry about. At 14-16 days of age the eyes open and the babies are fully covered in fur. The babies are fully weaned and can be removed from the mother at 4 weeks of age.

http://en.wikipedia.org/wiki/Roborovski_hamster

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