Thanks to its thick coat of fur, its tough hide, and a four inch layer of blubber, a polar bear is extremely well insulated.
Can you imagine lasting an entire month without sleep? Believe it or not, newborn dolphins and killer whales have been observed to do just that. Learn more on this Moment of Science.
Eating snow to obtain water is metabolically expensive–it would take too much energy to melt down enough snow. Consequently, polar bears have evolved so that they don’t need to drink free water.