Polar
bear is a the largest land
carnivores in the world, first runner up only by the Kodiak brown
bears of southwestern Alaska and they also a marine mammals which
spend much of their time on Arctic sea. A boar (adult male) can
weighs around 350–700 kg while a sow (adult female) is about half
that size. The climate of the Arctic
is characterized by
long, cold winters and short, cool and some parts of the Arctic are
covered by ice for a whole year and nearly all parts of the Arctic
are covered for a long periods with some form of ice on the surface.
Average temperatures range from about −34 °C to 0 °C and winter
temperatures can drop below −50 °C. Do you ever doubt how polar
bear can live in such a terrible climate and we will discover all the
secrets as follows:-
- A Special Fur
One physical feature that helps the polar bear stay warm is its fur coat. The coat is made up of two distinct layers: a short and dense underfur layer right next to the skin, and an outer layer of longer and coarser guard hairs. The guard hairs are transparent but the polar bear’s coat appears white because it is reflected with the surrounding environment.
Research
on these transparent guard hairs has revealed a key property that
helps to prevent heat loss in the cold Arctic air. The guard hairs
appear to be very effective at absorbing infrared radiation which is
the source of heat. This means that heat emitted from the polar
bear’s warm body could be absorbed by the hairs instead where it
would be lost to the cold environment. Moreover, its fur has the
oily fur layer is a reliable tool, bears want to get dry as soon as
possible because cold water takes away more heat together with air.- Special Body Features
Actually
, polar bear has a dark sink which it is good to absorb the sunlight
to store the heat in its body and under the dark skin there is a
thick blunder to insulate body from losing the heat. Its adorably
small ears and tails, plus particularly large and furry feet are
about minimizing heat loss.
No comments:
Post a Comment