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In page Hamster:

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In the wild Syrian hamsters can hibernate and allow their body temperature to fall close to ambient temperature. This kind of thermoregulation diminishes the metabolic rate to about 5% and helps the animal to considerably reduce the need for food during the winter.[1] Hibernation can last up to one week but more commonly last 2–3 days.[3] When kept as house pets the Syrian hamster does not hibernate.[3]