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Sunday, 12 May 2013

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Most hamsters are strictly solitary. If housed together, acute and chronic stress may occur,[5] and they may fight fiercely, sometimes fatally. Some dwarf hamster species may tolerate conspecifics. Russian hamsters form close, monogamous bonds with their mates, and if separated, they may become very depressed. This happens especially in males. Males will become inactive, eat more, and even show some behavioral changes similar to some types of depression in humans.[citation needed] This can even cause obesity in the hamster.

Chronobiology [edit]

Evidence conflicts as to whether hamsters are crepuscular or nocturnal. Khunen writes, "Hamsters are nocturnal rodents who [sic] are active during the night...",[5] but others have written that because hamsters live underground during most of the day, only leaving their burrows about an hour before sundown and then returning when it gets dark, their behavior is primarily crepuscular.[citation needed] Fritzsche indicated although some species have been observed to show more nocturnal activity than others, they are all primarily crepuscular.[4]

Wild Syrian hamsters are true hibernators and allow their body temperature to fall close to ambient temperature (but not below 20°C). 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.[5] Hamsters may not hibernate per se, but instead reduce the rate of a number of physiological systems, such as breathing and heart rate, for short periods of time. These periods of torpor (defined as "a state of mental or physical inactivity or insensibility"[12]) can last up 10 days

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