While bears are probably the first animal you think of when you think hibernation, they don’t actually hibernate, well not in the true sense at least. Bears go into torpor, which while similar to hibernation is different. When in torpor bears reduce both their heart and breathing rate, and their temperature drops, but less so than animals that hibernate. When in torpor bears can and do wake up easily, but they can go for days without waking, eating, drinking or going to the toilet.