A Trivia Book on Polar Bears

Polar bears are in grave danger of going extinct due to the
warming of the planet. The bears were the first vertebrate
species to be listed under the U.S. Endangered Species Act
as threatened with extinction.
Often referred to as the largest land carnivores in the world,
polar bears are marine mammals and spend much of their
time on Arctic sea ice, often hundreds of miles from land.
Climate change is melting their icy habitat, making it
increasingly difficult to travel, hunt and raise their young.
Some scientists believe the polar bear was once a close
relative to the brown bear. They think that, over time, polar
bears moved to the Arctic, where they adapted to their
surroundings by developing fur that would help them blend
in with the harsh, white Arctic ice.
Inhabiting the ice and sea of the Arctic, polar bears are wellequipped
for survival in a harsh environment. Two coats of
fur and a thick layer of blubber help insulate the polar bear's
body from the cold, keeping its temperature at an even 37°
C (98.6° F).
Polar bears are thought to be the only animal to hunt
humans actively.
A bear can assimilate 84% of the protein and 97% of the fat
it eats. Polar bears need an average of 2 kg (4.4 pounds) of
fat per day to obtain enough energy to survive. A ringed seal
weighing 55 kg (121 lbs) could provide up to eight days of
energy for a polar bear.