Polar bears are the top predator in the Arctic food chain, so they absorb all the toxic contaminants from the lower animals.
Polychlorinated biphenyls (PCBs) were once used as a cooling fluids and insulators in Transformers and electric motors, but were widely contaminating the environment, so in 2004 the international community acted to ban the synthetic chemicals.
PCBs dissolve easily in fat, and the mother bears' milk is rich in fat, so this is how they are passed on to the young cubs.
PCBs interfere with the bears' thyroid hormones, which are essential to control their temperatures In the freezing Arctic conditions.
A study in 2008 showed that amounts of PCBs in Norwegian polar bears have dropped significantly, though they are still at dangerous levels.
because they need fat to keep warm from the cold
Since 1973 there have laws restricting hunting of polar bears. Some numbers are still authorised in some countries.Since 2004 there are global bans on polychlorinated biphenyls (PCBs), a synthetic chemical that is still weakening polar bears.
a polar bear is not a desert animal it is a polar animal.
polar bears are related to bears.
Polar bears do.
They reproduce.
POLAR BEARS Polar bears actually grow pretty fast.
Polar bears are bears
Polar bears are mammals.
humans are polar bears
A sleuth or a sloth of bears
Polar bears are animals of Arctic regions. The only polar bears here are in the NC Zoo.
There are no polar bears in Antarctica. If there were, they would eat the penguins.