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Actually at one time they could hibernate. You must remember these animals are the oldest living live birth land animal and have remained mostly unchanged for 50 million years. Now one of the parts that have changed is they have lost the yellow fat deposits which are the stores used while hibernating. Living in warm areas they haven't needed to hibernate in quite a long time. But they still have the instinct to hibernate if they get colder than they have been used to for a few million years. The European hedgehog does hibernate if I am not mistaken. Our mixed breed African hedgehogs haven't lived in cold enough regions until humans shipped them to North America approximately 20 years ago. So when you look at the evolution time line a couple of decades isn't very long when compared to how long they did fine on their own in the wild. It is only due to us humans displacing them that hibernation is an issue. If we lived in climates they are used to they would almost never attempt hibernation.
 
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