Nope! Bears eat a huge amount of calories before hibernation, storing them in the form of fat. During hibernation their metabolism slows down so that they go through all those stored nutrients incredibly slowly. Hibernating black bears can go up to 100 days without eating or drinking.
Bears do not need to drink water while hibernating. The body process bears undergo during the period of hibernation helps them to survive. As their fat metabolizes, water is released, fulfilling all of their moisture needs. In a process that is still not fully understood, bears are also able to convert urea back into protein, eliminating the need to expel waste.
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