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托福阅读背景知识之记忆力惊人的鸟类

2015-01-09 19:26:29来源：网络

　　2015年托福考试已经来临，对于每一位参加托福考试的同学来说都是新的开始，那么我们对于托福听说读写都需要采取怎样的复习方法?下面是新东方在线托福小编整理的托福阅读背景知识之记忆力惊人的鸟类，供同学们参考!

　　很多动物都会储存食物，而这需要一定的记忆力。在下面的新托福考试阅读练习资料中将介绍一种记忆力惊人的鸟类。

　　Humans may be one of the smartest animals onthe planet, but when it comes to remembering wherethings are, Clark's nutcrackers have us beat.

　　A relative of jays and crows, nutcrackers hide pine seeds in the ground each autumn sothey have a source of food during the Colorado Rocky Mountain winter. They cache as many as30,000 seeds in 5,000 different locations over a fifteen square mile area. Since they cannotsmell the seeds buried in the soil very well, they must use their remarkable spatial memory tofind them.

　　Nutcrackers are not the only animals that cache food. Caching behavior is seen in birds,mammals and even insects. Chickadees store collections of seeds, insects and spiders in thebark of trees or under leaves. Red squirrels cut conifer cones from trees and bury them inplant litter on the forest floor. Harvester ants bring seeds back to their nests and store them inchambers, while honey bees save nectar and pollen in their hive.

　　Because nutcrackers are one of the best at remembering cache locations, researchers arestudying them to find out why they have such great memories. Scientists know that thenutcracker's abilities evolved because of environmental pressure. Nutcrackers with poormemories did not likely survive the harsh mountain winters. Now researchers want to find outhow the brains of nutcrackers are different from other brains. They are particularly interested inthe hippocampus, a small area of the brain that helps form memories. Finding out how thenutcracker's brain is different from other species may give us clues to why humans havememory problems. It may even lead to a cure for Alzheimer's disease.

　　人类也许是世界上最聪明的动物之一，但说到记忆，克拉克(新泽西州)的星鸟比我们人类强多了。

　　星鸟属于松鸟和乌鸦的近亲，它在秋天的时候把松子藏在地底下，这样寒冷冬天的就有食物吃了。它们会储存多达30000颗种子，而且是在十五平方公里内的5000个不同位置。因为不能通过气味辨别埋在土里种子的位置，它们就必须依靠惊人的空间记忆力来找到这些种子。

　　以上就是新东方在线托福小编整理的托福阅读的相关内容，更多资讯敬请访问新东方在线托福频道，祝大家取得理想的成绩!


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