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clear

concern

follow

harm

important

prepare

 

WHY DO POLAR BEARS HAVE BLACK SKIN?

Pictures of polar bears often show white bears in white surroundings. In some languages,
they are even known as ‘ice bears’ or ‘white bears’. However, the truth 8.1. _____________
the colours of a polar bear is more complex than most people think.

New-born polar bear cubs fit within the palm of your hand; they are blind and toothless, with
pink skin showing through a short white fuzz. Even their little noses and foot pads are pink!
But at the age of 3–4 months, their pink skin turns black. Because of their thickening coat
of fur, the now black skin is 8.2. ____________________ seen only on their nose, lips, and
foot pads. Having black skin is of great 8.3. ____________________ to the bears. First,
darker colours are better at absorbing heat from the sun, which is an advantage to a polar
bear trying to stay warm in the Arctic. Second, dark colours give better protection against
8.4. ____________________ UV radiation from the sun. The sunlight polar bears are
exposed to is intensified when it is reflected off the snow, ice and water that make up
the bears’ environment.

Na podstawie: polarbearsinternational.org