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North Pole is the northern end of the Earth spin axis, that is the point of 90 ° north latitude. Arctic near the North Pole is latitude 66 ° 34 'area within the Arctic Circle. The frozen Arctic Ocean is a vast ocean, surrounded by numerous islands and coastal areas of northern North America and Asia. Cold waters of the iceberg from the Arctic Ocean flows carrying the Atlantic and Pacific. Arctic cold climate throughout the year. Winter, the sun is always below the horizon, the sea ice completely frozen. Summer, the temperature rose to above freezing, melting the edge of the Arctic Ocean, the sun for weeks are hanging in the sky. Arctic Ocean are rich in fish and plankton,
This summer here, millions of seabirds nesting provides a rich source of food, and also the seals, whales and other marine animals.Most areas around the Arctic Ocean are flat, no trees. Winter, frozen earth, the ground covered with thick snow. Summer snow melt, thaw the surface soil, plants grow and blossom, as the reindeer and musk oxen and other animals with food. Meanwhile, wolves and polar bears and other predators also depend on other animals to survive predation. Arctic is the world's most sparsely populated areas. Since centuries, the Inuit (formerly Eskimo) sound reproduction from generation to generation here. Recently, the discovery of oil here, so many people came to work here from the south.
The most representative and symbolic animal is the Arctic polar bears.
As the name suggests, polar bears live in the Arctic. Their home in the Arctic ice and the surrounding islands, as well as the adjacent mainland near the coast, was the circumpolar distribution of basic. They generally will not go deep into more northern areas, where the ice is too thick, and even their main prey - seals can not break the ice out, no food, polar bears will naturally not take the risk.
Polar bears living there were classified into six species: Russia Wrangel Island - Alaska Western populations; population in northern Alaska; the Canadian Arctic archipelago population; Greenland population; Norway, Svalbard - 俄罗斯法兰兹 Joseph Island population and to central populations in northern Siberia.
Polar bear in the bear family animal family are genuine carnivores, they feed seals, especially ringed seals, will also prey bearded seal, harp seal, crown seals. In addition, they also capture the walrus, beluga whales, seabirds, fish, small mammals, sometimes cleaning the carrion. , And other bear species have different, they are not eating the food will not hide after the eat, etc. (This is one great convenience to other animals, such as Arctic fox lazy or similar), even after the fat from time to time to enjoy complete to walk away, know that for them, high-calorie fat is more important than the meat,
Because they need to maintain a warm layer of fat used, also need to store energy when food shortages. Polar bears are not vegetarians do not stick a little, occasionally in the summer they eat berries or plant roots, although they are not high in terms of nutritional value.
Polar bears are excellent swimmers, so that once people believe that marine animals, it is not only the Latin name U. maritimus means "sea" Bear. Polar bears in their lives most of the time (66.6%) were in the "static" state, such as sleeping, lying down resting, or waiting for prey. The remaining approximately 29.1% of the time walking or swimming in the land, 1.2% of the time in the attack prey, what is left is to basically enjoy delicious. There are two kinds polar bear hunting mode, the most common is the "passive" method. They will advance to find the ice seal's breathing hole
And highly endurance waiting several hours in the next. Wait until the seals appear, they will launch a surprise attack, with sharp claws hook to drag the seal up from the breathing hole. If the seals on shore, they would hide in places where seals eye can not see, and then crept to come crawling to launch onslaught. Another model is to sneak into the ice directly under seal until close to the shore before the attack, so the advantage is a direct escape route cut off the seals. Satiate, the polar bears will carefully clean up the hair, the food residue of blood are cleaned.
北极是指地球自转轴的北端，也就是北纬90°的那一点。北极地区是指北极附近北纬66°34′北极圈以内的地区。北冰洋是一片浩瀚的冰封海洋，周围是众多的岛屿以及北美洲和亚洲北部的沿海地区。冰冷的海水携带着冰山从北冰洋流入大西洋和太平洋。北极地区的气候终年寒冷。冬季，太阳始终在地平线以下，大海完全封冻结冰。夏季，气温上升到冰点以上，北冰洋的边缘地带融化，太阳连续几个星期都挂在天空。北冰洋中有丰富的鱼类和浮游生物，这为夏季在这里筑巢的数百万只海鸟提供了丰富的食物来源，同时，也是海豹、鲸和其他海洋动物的食物。北冰洋周围的大部分地区都比较平坦，没有树木生长。冬季大地封冻，地面上覆盖着厚厚的积雪。夏季积雪融化，表层土解冻，植物生长开花，为驯鹿和麝牛等动物提供了食物。同时，狼和北极熊等食肉动物也依靠捕食其他动物得以存活。北极地区是世界上人口最稀少的地区之一。千百年以来，因纽特人（旧称爱斯基摩人）在这里世代繁衍声息。最近，这里发现了石油，因而许多人从南部来到这里工作。
最有代表性和象征北极的动物是北极熊。
顾名思义，北极熊生活在北极。它们把家安在北冰洋周围的浮冰和岛屿上，还有相邻大陆的海岸线附近，基本呈环极分布。它们一般不会深入到更北端的地方，因为那里的浮冰太厚了，连它们的最主要猎物——海豹也无法破冰而出，没有食物，北极熊自然不会去冒险。生活在那里的北极熊被我们分为六大种群：俄罗斯弗兰格尔岛－阿拉斯加西部种群；阿拉斯加北部种群；加拿大北极群岛种群；格陵兰种群；挪威斯瓦尔巴特群岛－俄罗斯法兰兹约瑟夫群岛种群以及西伯利亚北部至中部种群。
北极熊在熊科动物家族中属于正牌的食肉动物，它们主要捕食海豹，特别是环斑海豹，此外也会捕食髯海豹、鞍纹海豹、冠海豹。除此之外，它们也捕捉海象、白鲸、海鸟、鱼类、小型哺乳动物，有时也会打扫腐肉。和其他熊科动物不一样的是，它们不会把没吃完的食物藏起来等以后再吃（这倒是大大方便了别的动物，比如懒惰的同类或者北极狐），甚至时常享用完脂肪之后就扬长而去，要知道对它们而言，高热量的脂肪比肉更为重要，因为它们需要维持保暖用的脂肪层，还需要为食物短缺的时候储存能量。北极熊也不是一点素食不沾，在夏季它们偶尔也会吃点浆果或者植物的根茎，尽管对它们而言营养价值不高。
北极熊是非常出色的游泳健将，以至于曾被人认为是海洋动物，它的拉丁名U. maritimus既指“海”熊。北极熊在它们的生命中大部分时间（66.6%）是处于“静止”状态，例如睡觉、躺着休息，或者是守候猎物。剩下约有29.1％的时间是在陆地行走或游水，1.2％的时间在袭击猎物，最后剩下的时间基本是在享受美味。北极熊一般有两种捕猎模式，最常用的是“守株待兔”法。它们会事先在冰面上找到海豹的呼吸孔，然后极富耐力地在旁边等候几个小时。等到海豹一露头，它们就会发动突然袭击，并用尖利的爪钩将海豹从呼吸孔中拖上来。如果海豹在岸上，它们也会躲在海豹视线看不到的地方，然后蹑手蹑脚地爬将过来发起猛攻。另外一种模式就是直接潜入冰面下，直到靠近岸上的海豹才发动进攻，这样的优点是直接截断了海豹的退路。吃饱喝足后，北极熊会细心清理毛发，把食物的残渣血迹都清除干净。
Starving polar bears turn to cannibali *** 。
最近拍摄到的照片显示，由于全球变暖导致猎食地消失，北极熊开始捕食同类。
New pictures show that polar bears are beginning to cannibalise each other as global warming destroys its hunting grounds。
北极熊通常在浮冰上抓捕海豹作为食物。但由于全球变暖，浮冰融化，在海上猎食也越来越困难，北极熊的捕猎场所也不得不转移到陆地上。
Polarbears usually subsist on seals, which they hunt from a platform of seaice. But the melting of sea ice as a result of rising globaltemperatures has made it more difficult for polar bears to hunt sealsat sea, confining the bears to land。
有更多的北极熊淹死在海里，因为它们被迫游向更远的海域去寻找食物。
Drowning is also more mon as bears are forced to swim further out to sea to find food。
这些照片进一步证实了越来越多处于绝境之中的北极熊，为了生存，开始捕杀自己的同伴。科学家们称本年度内已经发生八起这样的事件。
Theimages add to the evidence that polar bears are increasingly huntingeach other for food in their desperation to survive.Scientists say theyare aware of eight cases so far this year。
美国地质调查局和世界自然保护联盟近日分析指出，在接下来的五十年内，由于全球变暖，极地浮冰融化，世界上仅存的20000到25000只北极熊还将减少三分之二。
Recent *** ysis by the US Geological Survey and World Conservation Union foundthat o-thirds of the 20,000 to 25,000 polar bears in the world couldbe lost in the next 50 years as warming temperatures melt the ice。
失去浮冰栖息地，北极熊将无法长期生存下去。其他威胁，包括原油和天然气钻探、海运及有毒物质污染，与气候剧变和浮冰融化相比都不值一提。
Withoutthe sea ice habitat, the polar bear will not survive in the long term.There are other threats, such as oil and gas drilling, shipping andtoxins, but they pale in parison to climate change and the loss ofthe sea ice。
关于熊猫的初二下英语作文,80个单词左右
We all know that the panda, it's very cute, but I often read in many people for their own economic interests to kill it, I feel very sad. The giant panda is our country special product, it is the unique face has bee ＂the WWF＂ sign. The panda is like a bear, but not bear, at about 1.5 meters, weighs 160 kilograms, black and white on the appearance of body hair is their characteristics. The panda temperament is gentle, posture and movement are particularly lovely. In all over the world in the zoo, the giant panda is the most popular pet tourists. The giant panda this animal or representative of the remaining ancient animals, about 100 more than ten thousand years ago, the giant panda will live on the earth, so they have a ＂living fossil＂ said. Don't let this lovely and rare animals in the face of the earth? It is up to us to protect lovely and rare animals--the panda!
帕丁顿熊英文版作文怎么写？
However, when we reached the top, we were shocked to see litter here and there, such as bottles and banana peels. Then we started to pick up the litter and put the rubbish into the nearby recycling bin and non-recycling bin respectively.
英语作文关于熊出没的~主要内容熊大熊二保护森林的
在人烟稀少的大森林里，住着一些动物，有猫头鹰、松鼠、狐狸、猴子和两只狗熊。
狗熊一只叫熊大，一只叫熊二。
两只狗熊总是要捍卫森林，因为森林另一面的木屋住着一个叫光头强的猎人，他经常砍伐森林，破坏环境，捉走小动物。
但有两只狗熊，他的计划就休想得逞。
有一回，光头强去伐木场砍树，两只狗熊偷偷地把狩猎区和伐木场的路标互换，等光头强进去了，又把狩猎区和野兽区的路标换了。
结果光头强误把狩猎区当成伐木场，进去正准备砍树时，几颗子弹打掉了自己的帽子，接着又有几颗子弹打烂了帽子。
光头强觉得很奇怪，他害怕子弹打到自己，就丢下帽子躲开了这个地方，谁知又进入了野兽区，一进去就被老虎吓得魂飞魄散，脚一滑，滚下了山坡。
等光头强醒来时，看见两只熊手里拿着一个路标对他笑，上面写着“动物保护区”，他想：“原来是这两只狗熊捣鬼，现在还想骗我，没门！”他拿着电锯向狗熊砍去，突然，一声大喊震住了他。
“前面的光头，放下武器，这里是动物保护区，不准狩猎，要拘留你十天！”看着光头强被带走，熊大和熊二高兴地回家了。
这个故事告诉我们，每个人要爱护动物，爱护森林，更要爱护大自然。
在人烟稀少的大森林里，住着一些动物，有猫头鹰、松鼠、狐狸、猴子和两只狗熊。
狗熊一只叫熊大，一只叫熊二。
两只狗熊总是要捍卫森林，因为森林另一面的木屋住着一个叫光头强的猎人，他经常砍伐森林，破坏环境，捉走小动物。
但有两只狗熊，他的计划就休想得逞。
有一回，光头强去伐木场砍树，两只狗熊偷偷地把狩猎区和伐木场的路标互换，等光头强进去了，又把狩猎区和野兽区的路标换了。
结果光头强误把狩猎区当成伐木场，进去正准备砍树时，几颗子弹打掉了自己的帽子，接着又有几颗子弹打烂了帽子。
光头强觉得很奇怪，他害怕子弹打到自己，就丢下帽子躲开了这个地方，谁知又进入了野兽区，一进去就被老虎吓得魂飞魄散，脚一滑，滚下了山坡。
等光头强醒来时，看见两只熊手里拿着一个路标对他笑，上面写着“动物保护区”，他想：“原来是这两只狗熊捣鬼，现在还想骗我，没门！”他拿着电锯向狗熊砍去，突然，一声大喊震住了他。
“前面的光头，放下武器，这里是动物保护区，不准狩猎，要拘留你十天！”看着光头强被带走，熊大和熊二高兴地回家了。
这个故事告诉我们，每个人要爱护动物，爱护森林，更要爱护大自然。
熊出没的英语作文
Recently,I watched a cartoon,called ＂bear＂,I feel very meaningful,because this cartoon teaches us to protect forests,don't cut the trees.There are three protagonistsare the ＂bear＂,＂the o bears＂ and ＂head＂,the bald strong a lumberjack,looks like Zhao Benshan.Head each time with a chainsaw when were the ＂bear＂,＂the o bears＂ heard after a hard lesson from the.Have a saying is bald with a way,the secret is to ownappearance made of wax people saw wood in the forest,the bear o saw the bald strong in the past logging after beaten up results,bald is a fake.So several round hits is a wax people head strong,bears o has been tired out.Really bald in La ＂fish in troubled waters＂ in the felling of trees.Can bear very clever it first listen to the sound,was observed after sawing traces.After a while,the bald strong to find out.I want tolearn to bear the same careful observation,but also learn to *** yze every thing in the brain.
关于濒临灭绝的大熊猫的英语作文60至80词
我叫大熊猫 大家好！ 我是国家一级保护动物，我平生没有照过彩色照片真是好可怜。
你知道我怎样才能照出彩色照片吗 ？那就是伸出舌头。
嘿嘿，你知道我是谁了吧，我就是大名鼎鼎的大熊猫！ 我最喜欢吃的食物是竹子。
我体型肥硕，行动缓慢，视觉较差，性情温顺，憨厚可掬，但头圆尾短。
头部和身体毛色绝大多数为黑白相间，即鼻吻端、眼圈（呈“八”字排列）、两耳、四肢及肩胛部（横过肩部相连成环带）为黑色，其余即头颈部、躯干和尾为白色。
腹部淡棕色或灰黑色。
其体长120~180cm；尾长10~20cm，白色；肩高一般为除了5个带爪65~70cm；体重60~125kg。
前掌的趾外，还有一个第六趾。
背部毛粗而致密，腹部毛细而长。
我还有几个好听的别称，就是竹熊、花熊， 大约分布在四川、陕西、甘肃局部地区。
我小的时候，一般只有100多克重，最小仅50多克，最大也不过200多克。
我出现到现在已经有八、九百万年了，非常古老。
（313字） 你们喜欢我吗？自己翻译吧！！！！...
关于北极熊80字英语作文
Bears can be found throughout the world. They are generally large animals, and are characterized by a plantigrade walk (on their heels, like humans), a large body, short legs, a stub of a tail, *** all, round ears, and forward facing eyes.
格列佛游记马国英语作文
马，最美好的动物！马不会像袋鼠那样跳远；不会象鸟一样滑翔；不会象熊一样爬树；不会象蛇一缠蜒。
它没有尖牙、没有利爪、没有清晰的视力、没有矫健的翅膀、更没有坚硬的鳞片。
每个人都有自己心中完美的动物，也就是自己心中最喜爱的动物，而在我眼里的马，不是完美而是美好。
我个人认为，世界上没有最完美的事物，包括人类。
任何东西都是有缺陷的，俗话说：“人有喜怒哀乐，月有阴晴圆缺。
”这句话句足以证明世间万物都不是完美的，包括那些曾被我认为是完美的动物——马。
马不会像袋鼠那样跳远；不会象鸟一样滑翔；不会象熊一样爬树；不会象蛇一缠蜒。
它没有尖牙、没有利爪、没有清晰的视力、没有矫健的翅膀、更没有坚硬的鳞片。
但没有这些条件，却依然让野马成了草原上的国王。
因为马不会为一食物而互相撕打，它们团结友善，从不发生内战。
它们美好是因为它们品德高尚，它们善良是因为它们愿意帮助别人。
《白马飞飞》看过吧，飞飞忠心耿耿，爱憎分明，毫不屈服于敌手。
野马在我国境内仅剩50匹，望大家可以多关照，不要去伤害它们，因为它们从来没有想过要伤害其他动物，除非它先被惹怒了—不过顶多也就是将入侵者赶出去或踏伤，很少有被马群踏死的动物。
马还会舍己为群，这正是它的高尚品德之一，当马群被肉食者追赶得有些疲惫时，马群中会有一匹老马停下来，成为捕食者的食物，牺牲自己，为马群的逃跑延长了时间。
在马群中，不同级别的马会受到不同的关怀，小马被保护得最严密，经常在马群中央，随后是母马。
年轻力壮的雄马和雌马会担任保护小马的工作。
而最倒霉、最容易受到的关怀最少的老马站在最外层，担任随时牺牲自己，保护其他马的工作；而雄性首领则会在顶前头领队，雌性首领则断后察看敌情，若有强敌，嘶鸣一声后加快速度奔跑，同时一匹老马也会留下来当诱饵困住捕食者。
为马群争取时间逃跑。
马的意志坚定，不会因为一个小意外而放弃自己的目标，《小马王》肯定很少有人看，虽然只是一部动画片，但描述的却是一个真实的故事。
小马王被人类抓走后，一直坚持自己可以回家。
到最终，小马王果真回到了大草原的怀抱、回到了家乡，还带回了一匹美丽、温柔的小母马。
虽然在这期间小马王历经千辛万苦有一次甚至面对死亡都毫不畏缩，并解救了数百匹马。
但意志太过坚定反而对马的自身有害，有的马要那儿吃草；有的马要去小溪喝水。
这样一来，一个原本团结强大的马群一下子变成了一盘散沙，难攻难守。
只要猎食者一到，再精明强干的马也无法挽回死亡的悲剧。
马通人性，在主人伤心时用脸去抚摸一下主人的脸；在主人开心时，与主人一起分享欢乐、一起上战场、一起游览山河。
战马听惯了沙场撕吼、兵器击撞的声音，战死沙场，它觉得光荣；牺牲自己被猎食者吃掉，它觉得英雄。
马有自己的想法，正因为这样，它有时在主人面前耍大牌、赖皮、倔、不听命令，大多数的雌马都是这样的。
正因为这样，马在马群里才能“各抒己见”，“发挥特长”。
雄马最容易被雌马弄得神魂颠倒，所以，首领要经常换，不然，“庸王”统治国度，谁都不会答应。
在像沙漠那样极度缺水的环境下，首领会将一部分到了一定年龄的小马赶出马群，任它自身自灭，但这也是迫不得已，马多了，水不够喝，大家都会渴死，而被赶出去的小马会与从其它群体赶出的小马汇合，重新组织成一个新的群体。
马不是最完美的动物，但世界上也没有比它更完美的动物（我个人认为），马的精神一直影响着人类直至今日。
团结友善、关心爱护、意志坚定、铁面无私、忠心耿耿、爱憎分明、纤细善良等等。
良好的精神让人类的文明更上一层楼。
它难道不是美好的动物吗？
金凤花姑娘和三只熊英语作文80词
高考英语作文有可参考的模版，详情如下： 高考英语写作模板：图表作文举型 as is shown/indicated/illustrated by the figure/percentage in the table(graph/picture/pie/chart)， ___作文题目的议题_____ has been on rise/ decrease (goesup/increases/drops/decreases),significantly/dramatically/steadily rising/decreasing from______ in _______ to ______ in _____. From the sharp/marked decline/ rise in the chart, it goes without saying that ________. There are at least o good reasons accounting for ______. On the one hand, ________. On the other hand, _______ is due to the fact that ________. In addition, ________ is responsible for _______. Maybe there are some other reasons to show ________. But it is generally believed that the above mentioned reasons are monly convincing. As far as I am concerned, I hold the point of view that _______. I am sure my opinion is both sound and well-grounded. 高考英语写作模板：对比观点题型 （1）要求论述两个对立的观点并给出自己的看法。
1.有一些人认为…… 2.另一些人认为…… 3.我的看法…… The topic of ①——（主题）is being more and more popular recently. There are o sides of opinions about it. Some people say A is their favorite. They hold their view for the reason of ②——（支持A的理由一）What is more， ③——理由二）。
Moreover， ④——（理由三）。
While others think that B is a better choice in the following three reasons. Firstly，——（支持B的理由一）。
Secondly (besides)，⑥——（理由二）。
Thirdly (finally)，⑦——（理由三）。
From my point of view, I think ⑧——（我的观点）。
The reason is that ⑨——（原因）。
As a matter of fact, there are some other reasons to explain my choice. For me, the former is surely a wise choice . (2)给出一个观点，要求考生反对这一观点 Some people believe that ①——（观点一）。
For example, they think ②——（举例说明）。
And it will bring them ③——（为他们带来的好处）。
In my opinion, I never think this reason can be the point. For one thing，④——（我不同意该看法的理由一）。
For another thing， ⑤——（反对的理由之二）。
Form all what I have said, I agree to the thought that ⑥——（我对文章所讨论主题的看法）。
高考英语写作模板：议论文举型 议论文的框架 （1） 不同观点列举型（ 选择型 ） There is a widespread concern over the issue that __作文题目。
But it is well known that the opinion concerning this hot topic varies from person to person. A majority of people think that _ 观点一________. In their views there are 2 factors contributing to this attitude as follows: in the first place， ___原因一_______.Furthermore, in the second place， ___原因二_____. So it goes without saying that ___观点一_____. People, however, differ in their opinions on this matter. Some people hold the idea that_观二_____. In their point of view, on the one hand， ___原因一_______. On the other hand， ____原因二_____. Therefore, there is no doubt that ___观点二______. As far as I am concerned, I firmly support the view that __观点一或二_. Itis not only because ________, but also because _________. The more _______, the more ________. (2)利弊型的议论文 Nowadays, there is a widespread concern over (the issue that)___作文题目______. In fact, there are both advantages and disadvantages in __题目议题_____. Generally speaking, it is widely believed there are several positive aspects as follows. Firstly， ___优点一______. And secondly ___优点二_____. Just As a popular saying goes, “every coin has o sides”，讨论议题is no exception, and in another word, it still has negative aspects. To begin with，缺 点 一 . In addition，缺 点 二 . To sum up, we should try to bring the advantages of 讨论议题into full play, and reduce the disadvantages to the minimum at the same time. In that case, we will definitely make a better use of the ____讨论议题___. （3）答题性议论文 Currently, there is a widespread concern over (the issue that)作文题目_______ .It is really an important concern to every one of us. As a result, we must spare no efforts to take some measures to solve this problem. As we know that there are many steps which can be taken to undo this problem. First of all， __途径一______. In addition, another way contributing to success of the solving problem is ___途径二_____. Above all, to solve the problem of ___作文题目______， we should find a number of various ways. But as far as I am concerned, I would prefer to solve the problem in this way, that is to say， ____方法_____. （4）谚语警句性议论文 It is well know to us that the proverb： “ ___谚语 has a profound significance and value not only in our job but also in our ...
First is called the garden balsam the little girl lives inside the village. She has discovered the house, and had not asked walked. Next she sat badly the bear baby's chair, has eaten the bear baby's thing, rested in on the bear baby's bed Then when bear es back, the garden balsam girl frightened badly! Requests them to five... ... Finally they became the friend, the garden balsam girl have not dared to steal again slide the others in the family!
转载请注明出处 » 有关保护北极熊的英语作文100字
The polar bear is the world's largest land carnivore, also known as polar bear, naive. Skin is black, because the hair is usually transparent so that the appearance of white, there are yellow and other colors, great size, ferocity.
Polar bears considerable human vision and hearing, but their sense of smell is very sensitive, is seven times the dog; when running the fastest speed of up to 60km / h, 1.5 times the world 100 meters champion. As global temperatures rise, gradually began to melt the Arctic ice floes, polar bears former home has been a certain degree of damage is likely to become extinct in the near future, human needs protection.
1、seal.海豹
2、arctic fox.北极狐
3、arctic hare.北极兔
4、polar bear.北极熊
5、snowy owl.雪猫头鹰
6、muskox.麝牛
7、reindeer.驯鹿
8、whale.鲸
9、arctic wolf.北极狼
10、lemming.旅鼠
Unlike Black and Grizzly bears, which are primarily nocturnal, the Polar Bear may be active at any time of the day or year, searching for prey on long summer days and sometimes on long winter nights. Adaptations to its Arctic habitat include its fur color, which blends with the snowy environment and so provides useful camouflage for capturing prey; its large size, which helps maintain body temperature by reducing surface-heat loss; and its furred feet, which insulate against cold and provide traction on icy surfaces. Because the hairs of its waterproof coat are hollow, they are especially insulating and increase the bear's buoyancy when swimming. An excellent swimmer, it paddles at about 6 1/2 mph (10 km/h) with the front feet only, hindfeet trailing-a trait unique among four-footed land animals-and can remain submerged for about two minutes. While swimming or treading water, it stretches its long neck for a better view, as it does on land. Owing to the scarcity of plants in its icy habitat, the Polar Bear is the most carnivorous North American bear, with canine teeth larger and molariform teeth sharper than those of other bears. An acute sense of smell enables the Polar Bear to locate prey even when it is hidden by snow drifts or ice. It stalks young seals and Walruses, and sometimes adult seals, often by swimming underwater to their ice floes. While hair seals are its staple, it also feeds on fish, birds, bird eggs, small mammals, dead animals (including whales), shellfish, crabs, starfish, and mushrooms, grasses, berries, and algae, when available. The Polar Bear hollows out a winter den in a protected snowbank, where it retires in a lethargic condition. Females den from November to March, during which time they give birth. Males den for much shorter periods, usually from late November to late January, but may be abroad occasionally at any time of the year. Cubs remain with their mother about a year and a half, denning with her the winter after their birth. The lowlands of Hudson Bay and James Bay, one of the world's largest denning areas for Polar Bears, is the only known region where Polar Bears den in earth rather than in snow. They excavate caves in lake and stream banks and peat hummocks by digging down to the permafrost. This area is unusually far south for the species, and it is believed that they use the permafrost dens again in summer to cool off. No large denning areas have yet been found in Alaska; some Polar Bears in that region may winter in Siberia, drifting across to Alaska on ice floes in spring. Polar Bears are a source of food and hides for Native Americans. 答案补充 英文好自己从中间找到答案!
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