【正文】 once thought that polar bears might survive by supplementing their pinniped diet by turning to terrestrial foods like snow geese, their eggs and caribou.We39。ve known for a long time, going back to research in the early 70s, even going to back to early explorer logs, that polar bears will consume terrestrial based foods. But the debate was always whether those foods actually add up, energetically. In other words, do these substitutes provide enough nutrition to make up for the lost seals?To find out, Pilfold and his colleagues estimated the weight lost each day by polar bears in the wilds of western Hudson Bay during the icefree season, when they could ostensibly be chowing down on terrestrial foods. Then they pared that to the weight lost by bears that are temporarily held in Manitoba39。s going to help supplement against longer icefree seasons, that really doesn39。 they39。s going to provide them with that type of fat are marine mammals. And they can only access those marine mammals when there39。t last as long without sea ice. So as the Arctic warms, younger polar bears will disproportionately die out. Leaving the species39。海冰在夏季開始融化斷裂。至少，情況應(yīng)該是這樣。那饑餓的北極熊要怎么辦?科學(xué)家曾經(jīng)認(rèn)為，北極熊可能會(huì)轉(zhuǎn)向陸地上的食物來補(bǔ)充它們對(duì)鰭足類動(dòng)物飲食的需求，進(jìn)而生存下去，這些陸地食物包括雪雁、雪雁蛋和北美馴鹿。”尼克“通過上世紀(jì)70年代初的研究，還有早期的探險(xiǎn)者日志，我們很早以前就知道，北極熊會(huì)以陸地食物為食?！睋Q句話說，這些替代食物能否為北極熊提供足夠的營養(yǎng)，彌補(bǔ)不能進(jìn)食海豹帶來的損失?為了解開這個(gè)疑惑，皮爾福德及同事對(duì)西哈德遜灣荒野地區(qū)的北極熊在無冰季期間每天失掉的體重進(jìn)行了估算，從表面上看，北極熊在這段時(shí)間食用了陸地食物。在被關(guān)期間，北極熊不吃東西。雖然野生北極熊能享用北極“小吃”，但是它們的體重每天也同樣會(huì)下降1公斤?！帮@然結(jié)果表明，陸地食物不能為北極熊提供足以抵消大量損失的能量。食物轉(zhuǎn)向食用陸地食物，并幫助它們對(duì)抗日益延長的無冰季這個(gè)觀點(diǎn)，并沒有在這項(xiàng)數(shù)據(jù)中得到證明?！瓣懙厥澄镆缘鞍踪|(zhì)和碳水化合物為基礎(chǔ)，而北極熊需要的食物以脂肪為主。它們高度適應(yīng)的情況是，將脂肪吸收進(jìn)它們的系統(tǒng)中，然后把這些脂肪放在身上以增加體重，這樣它們之后就可以依靠這些脂肪來度過禁食期。但是它們只能在有海冰時(shí)食用到這些海洋哺乳動(dòng)物。但是小一些的未成年北極熊已經(jīng)不再被哺育，它們必須要去獵食，可是它們不能在漫長的無冰季期間一直不進(jìn)食。這使這些物種的生存成為問題。這是一種非?？蓯鄣膭?dòng)物，很多人都非常喜歡它們。其中的一些種類有兩只大眼睛、大耳朵和一條長尾巴。每次我去動(dòng)物園，我都會(huì)去看猴子。它們高興的時(shí)候，還會(huì)特別表演給游客看，非常好玩。一篇什么樣的作文才能稱之為優(yōu)秀作文呢？以下是小編幫大家整理的寫動(dòng)物的英語作文6篇，供大家參考借鑒，希望可以幫助到有需要的朋友。clock noon in the afternoon at half past two piece of lean lean, under the care of me, little turtle gradually grew up ready to and dad took me to the zoo yesterday, and I will change the calendar to get up at 7:00 in the morning, nature, had changed to 7:10 feed the of I tired to sleep sleep in the night, was asleep incense, suddenly, only heard a loud “crash”.Ah!My head, I sat up, glanced at his watch “day!” It is time to the feed the turtle, I to the tank in a look, little turtle? I looked at around, little turtle was walking in my bed!And the turtle is hungry, it had to climb out of a fish tank, hit on my head to my protest!Since then, I think I dare not again late feed the turtle, lovely small tortoise!You say I love you or hate you?My lovely little turtle!我家有一只可愛的小烏龜。小烏龜托著一副有大又重的龜殼，四肢玲瓏嬌小的腳時(shí)伸時(shí)縮，一雙小小的眼睛整天不停地轉(zhuǎn)。每天吃飯要按時(shí)定點(diǎn)吃飯，每頓飯還必須吃瘦肉，它就會(huì)大發(fā)雷霆，把魚缸中的水撲騰到哪里都是。昨天爸爸媽媽帶我去了動(dòng)物園，我便把作息表改成早上7：00起床，自然喂小烏龜就改到7：10分了。呀!我的頭，我坐了起來,看了一眼表“天啊!”到時(shí)間該喂小烏龜了，我向魚缸里一瞧，小烏龜呢?我四處打量了一下，原來小烏龜正在我床上散步呢!敢情小烏龜餓了，它竟然從魚缸里爬了出來，砸在我頭上向我抗議呢!從此以后，我想我可不敢再晚喂小烏龜了，可愛的小烏龜呀!你說說我是喜歡你呢，還是討厭你呢?我可愛的小烏龜!寫動(dòng)物的英語作文 篇2Cats are cute animals,they are very special as has pointy ears, round eyes,little claws,and short but soft like eating fish and like to keep themselves clean, they do that by licking their they are nocturnal animals, they sleep in the daytime and do most of their movements at should love cat, because cats are our friends,too.寫動(dòng)物的英語作文 篇3Dogs, along with cats, are thought to be as the most favored as pets in America today.?This wonderful animal is valued for their panionship, protection and friendship they bestow to their it is hardly suprising to find dogs or cats on television shows and movies and who could not forget Lassie, one of the most famous canine of all time.?For the wonderful panionship this pet gives, it is vital the owner does his or her share of responsibilities that es on owning a dog.?The owner has the obligation to make certain that their pet receives adequate attention and affection, adheres to a nutritious diet, have regular visits to the vet for a check up or for shots and a plenty amount of exercise to keep them healthy and mentally it takes time and effort to care for your dog, the rewards ultimately pay off.? In return for their owner caring efforts, the dog will grant them unwavering loyalty, their affection and most important of all, the desire to please you.?This is probably the reason why people sometimes prefer this exquisite creature than their own and for years to e canines will remain people favorite snake is a long and thin animal that lives in grass or other dark ，生活在草叢里和陰暗的地方、A snake has no legs or feet, but it can move very fast on its ，靠胃部飛快的移動(dòng)前進(jìn)。Some kinds of snakes live in can swim as freely as ，他們能像魚一樣飛速的游移。 snakes can sleep through a whole winter without eating and can not feel any hibernation period lasts about five spring es, the snakes e out and begin their normal can take many things as food, such as mice, sparrows, frogs,birds39。s some time the lump snakes are dreadfullooking, people are afraid of people drive them away whenever they see in Chinese fairy tales, snakes are by no means seem to have human can change into pretty like and respect most wellknown is the story about the White Snake and the Blue fact, snakes are not as dreadful as they can help us to kill mice and can provide us with delicious blood is a good snakes are especially can make valuable drugs with them.寫動(dòng)物的英語作文 篇4My favourite animals are like them