Polar bear the fourhorn sculpin. With the exception of pregnant females, polar bears are active year-round, although they have a vestigial hibernation induction trigger in their blood. Unlike brown and black bears, polar bears are capable of fasting for up to several months during late summer and early fall, when they cannot hunt for seals because the sea is unfrozen. When sea ice is unavailable during summer and early autumn, some populations live off fat reserves for months at a time, as polar bears do not 'hibernate' any time of the year. Being both curious animals and scavengers, polar bears investigate and
Polar Bear, Polar Bear, What Do You Hear? Polar Bear, Polar Bear, What Do You Hear? Polar Bear, Polar Bear, What Do You Hear? is a children's picture book, published in 1991, written and illustrated by Bill Martin, Jr. and Eric Carle. The book is designed to help toddlers identify zoo animals and the noises they make. It features a polar bear, a lion, a hippopotamus, a flamingo, a zebra, a boa constrictor, an elephant, a leopard, a peacock, a walrus, a zoo keeper and some children. This is a companion book to "Brown Bear, Brown Bear, What Do You See?", published by Carle and Martin in 1967,