北极熊英文介绍PPT课件

目录北极熊(polar bear)的基本介绍 (1)聪明的北极熊 (1)北极熊的繁衍和生长 (2)北极熊的存在意义 (3)孤独的北极生命 (4)北极熊的故事 (4)北极熊(polar bear)的基本介绍北极熊(polar bear)也叫白熊，是熊类中个体最大的一种，其身躯庞大，体长可达2.5米以上，行走时肩高1.6米，体重可达半吨,最大的北极熊体重可达900公斤。

它具有粗壮而又灵便的四肢，尤其是它的前掌，力量巨大，一掌可使人致命。

用前掌击倒或打死猎物，是它的惯用手段。

掌上长有十分锐利的熊爪子，能紧紧抓住食物。

北极熊还具有异常灵敏的嗅觉，可以嗅到在3.2公图表 1里以外烧烤海豹脂肪发出的气味,能在几公里以外凭嗅觉准确判断猎物的位置。

在“闻出”气味熟悉的猎物的方位后，便能以相当快的速度从冰上跳跃奔去捕猎，一步跳跃奔跑的距离可达5米以上。

北极熊全身披着厚厚的白毛，甚至耳朵和脚掌亦是如此，仅鼻头有一点黑。

而且其毛的结构极其复杂，里面中空，起着极好的保温隔热作用。

因此，北极熊在浮冰上可以轻松自如地行走，完全不必担心北极的严寒。

北极熊的体形呈流线型，善游泳，熊掌宽大犹如双浆，因此在北冰洋那冰冷的海水里，它可以用两条前腿奋力前划，后腿并在一起，掌握着前进的方向，起着舵的作用，一口气可以畅游四五十公里，也算得上游泳健将了。

其熊瓜宛如铁钩，熊牙锋利无比，它的前掌一扑，可以使人的头颅粉碎，身首分家，可谓力大无穷。

它奔跑起来，风驰电掣，时速可达60公里，但并不能持续太久，只进行短距离冲刺，所以在宽阔的陆地上，假若人和熊进行长跑比赛的话，北极熊必败无疑。

北极熊经常栖息在冰盖上，过着水陆两栖生活，通常以海豹、鱼类、鸟类和其它小哺乳动物为食，若能幸运碰到鲸鱼的尸体，则可美美地饱餐一顿。

漫长寒冷的冬天，北极熊一般在巢穴里度过。

直到来年春季二三月才出来活动，3月～5月北极熊活动最频繁。

温暖的夏天，北极熊出穴四处寻找猎物。

介绍北极熊英文书The Arctic is home to many unique and interesting animals, but perhaps one of the most iconic is the polar bear. 北极是许多独特而有趣的动物的家园，但也许最具标志性的是北极熊。

These majestic creatures are the largest land carnivores in the world and are perfectly adapted to life in the extreme cold of the Arctic. 这些雄伟的生物是世界上最大的陆地食肉动物，完全适应了北极极端寒冷的生活环境。

Polar bears have a thick layer of blubber to keep them warm in the freezing temperatures of the Arctic. 北极熊有一层厚厚的脂肪层，可以在北极寒冷的温度中保持身体温暖。

This insulation is essential for their survival in such harsh conditions, as it helps them maintain theirbody temperature and conserve energy. 这种隔热层对它们在如此严酷的环境中生存至关重要，因为它帮助它们保持体温并节约能量。

Polar bears are excellent swimmers and are known to travel long distances in search of food. 北极熊是出色的游泳者，以寻找食物而闻名。

They have been observed swimming for hundreds of miles without rest, using their powerful front paws to propel themselves throughthe icy waters. 他们被观察到在不休息的情况下游泳数百英里，使用他们强壮的前爪推动自己穿过冰冷的水域。

北极熊英语介绍English:The polar bear, also known as the white bear, northern bear, or sea bear, is a large carnivorous bear native to the Arctic Circle. As the largest land carnivore, polar bears are uniquely adapted to their frigid habitat. Their thick fur and blubber provide insulation from the cold, and their large, powerful bodies allow them to swim long distances and hunt seals, their primary prey. Polar bears are excellent swimmers and have been known to cover distances of up to 60 miles in the water. They are also highly intelligent and have developed clever hunting techniques, such as stalking seal breathing holes in the ice. However, polar bears are currently facing significant threats due to climate change and human encroachment on their habitat. The melting of sea ice due to rising temperatures is causing a decline in polar bear populations as it reduces their hunting grounds and access to food. Conservation efforts are underway to protect these magnificent creatures and ensure their survival in the face of these challenges.中文翻译:北极熊，又称白熊、北极熊或海熊，是原产于北极圈的一种大型食肉熊。

Polar Bears Listed as ThreatenedPolar bears were added to the list of threatened species and will receive special protection under U.S. law. In his statement, Secretary of the Interior Dirk Kempthorne noted that the decline of Arctic sea ice is the greatest threat to the bears.Polar bears live in the Arctic and hunt seals and other fatty marine mammals from sea ice. They also travel, mate, and sometimes give birth on the ice. But sea ice is melting as the planet warms, and it is predicted to continue to do so for several more decades."Because polar bears are vulnerable to this loss of habitat, they are—in my judgment—likely to become endangered in the foreseeable future," Kempthorne said.Although many scientists say that human activity is directly responsible for the melting sea ice, the new polar bear protections will not change U.S. climate policy.The U.S. classifies the polar bear as a marine mammal, which means that the bear's new threatened status will not stop oil exploration within its habitat. Hunting of polar bears as a food source by certain native people and trade in native handicrafts made from polar bears will also continue. However, importing polar bear products from Canada (where trophy hunting is legal) will be banned.Scott Bergen is a landscape ecologist with the New York-based Wildlife Conservation Society and a contributing author to U.S. Geological Survey studies released in 2007 that found two-thirds of the world's polar bears could go extinct by 2050. He and other WCS staff are "almost elated" with the decision, he said."Even though it doesn't directly influence carbon emissions so to speak, we think it is a definite decision in the right direction and we're pleased to see the Fish and Wildlife Service is supporting the best science on this species," he added.Bergen noted that saving the polar bear will depend on international cooperation. Permanentsea-ice habitat is likely to remain in areas outside of the U.S., particularly in Canada and Greenland.Scientists view these areas as refuges that could allow some polar bear populations to survive over the long term and repopulate the Arctic if temperatures decrease and sea ice returns."If you take a long-term view—meaning a hundred-year view into the future," he said, "polar bears' existence is not necessarily totally dependent on what happens in the United States."Polar bears were added to the list of threatened species and will receive special protection under U.S. law. In his statement, Secretary of the Interior Dirk Kempthorne noted that the decline of Arctic sea ice is the greatest threat to the bears.Polar bears live in the Arctic and hunt seals and other fatty marine mammals from sea ice. They also travel, mate, and sometimes give birth on the ice. But sea ice is melting as the planet warms, and it is predicted to continue to do so for several more decades."Because polar bears are vulnerable to this loss of habitat, they are—in my judgment—likely to become endangered in the foreseeable future," Kempthorne said.Although many scientists say that human activity is directly responsible for the melting sea ice, the new polar bear protections will not change U.S. climate policy.The U.S. classifies the polar bear as a marine mammal, which means that the bear's new threatened status will not stop oil exploration within its habitat. Hunting of polar bears as a food source by certain native people and trade in native handicrafts made from polar bears will also continue. However, importing polar bear products from Canada (where trophy hunting is legal) will be banned.Scott Bergen is a landscape ecologist with the New York-based Wildlife Conservation Society and a contributing author to U.S. Geological Survey studies released in 2007 that found two-thirds of the world's polar bears could go extinct by 2050. He and other WCS staff are "almost elated" with the decision, he said."Even though it doesn't directly influence carbon emissions so to speak, we think it is a definite decision in the right direction and we're pleased to see the Fish and Wildlife Service is supporting the best science on this species," he added.Bergen noted that saving the polar bear will depend on international cooperation. Permanentsea-ice habitat is likely to remain in areas outside of the U.S., particularly in Canada and Greenland.Scientists view these areas as refuges that could allow some polar bear populations to survive over the long term and repopulate the Arctic if temperatures decrease and sea ice returns."If you take a long-term view—meaning a hundred-year view into the future," he said, "polar bears' existence is not necessarily totally dependent on what happens in the United States."。