北极熊英文介绍PPT课件

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Ecological role
• The polar bear is the apex predator（顶端食肉动物） within its range. Several animal species, particularly Arctic Foxes and Glaucous Gulls, routinely scavenge（清除） polar bear kills.
• small head ,small ears and round neck
• long, wide, foot and leg and palm are hirsute
• good swimmer
• black skin
Project Length Weight Speed
Life
DATA 240～260cm 400～800kg 60km/h 28～40 years
• The evolutionary pressure of polar bear predation on seals probably accounts for some significant differences between
Arctic and Antarctic seals.
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Because polar bears play an important role in Arctic environment, scientists feel that polar bear can be a good indicator of the health of Arctic environment.
• Excellent sense of smell • Ringed and bearded seals • wild foods and plants
So, we can say that by protecting polar bears, we are protecting the whole Arctic ecosystem.
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Global warming has an impact on the ice.
The ice is melting quickly in north and south pole. And that have a bad influence on polar bears. Due to the global warming, Arctic ice began to melt, the polar bear’s home has been destroyed, the prey is also a corresponding reduction in
Polar bear
The largest terrestrial carnivorous animal
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some pictures about Polar bear
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The polar bear is a bear native largely within the Arctic Circle encompassing （围绕，包围;） the Arctic Ocean, its surrounding seas and surrounding land masses. It is the world‘s largest land carnivore（食肉动物） and also the largest bear
• The relationship between ringed seals（环斑海豹） and
polar bears is so close that the abundance of ringed seals in some areas appears to regulate（调节） the density（密度） of polar bears, while polar bear predation in turn regulates density and reproductive success of ringed seals.
nose
the teeth are larger and sharper
The polar bear's claws are short and stocky .
Polar bear fur consists of
dense under fur and guard
. hairs.
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Appearance
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Habitat
• Marine mammal (because it spends many months of the year at sea).
• Arctic ring of life
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Hunting and Diet
• The most carnivorous member of the bear family (most of its diet consists of ringed and beardedBaidu Nhomakorabeaseals)
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Polar bears
In its existent space, it is the topmost food chain. It has thick fat and hair to stay warm, its white appearance on white snow is good protective coloration, and it can on land and sea, so it can catch food in the arctic in this extremely harsh（严酷的） climate.
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Polar bears are in danger, we must take measures to protect the kind of beautiful and lovely animal. Because it is the treasure of nature.
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Physical character