TPO49

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Like many creatures, humpback whales migrate long distances for feeding and mating purposes. How animals manage to migrate long distances is often puzzling. In the case of humpback whales, we may have found the answer: they may be navigating by the stars, much as early human sailors did. What we know about humpback whales makes this a distinct possibility.

First, humpback whales seem to be intelligent enough to use stars to navigate by. Whales’ brains have a high degree of complexity——a common determiner of intelligence. This suggests that the whales’ brain power far exceeds that of most other animals. The whales’ well-developed cognitive ability seems to provide a sound basis for the ability to use a complex, abstract system of sensory stimuli such as the night sky for orientation.

Second, humpback whales migrate in straight lines. Animals can maintain movement in a straight direction for long distances only if they orient themselves by some external objects or forces. Many birds and other terrestrial creatures, for example, use physical landmarks to help them stay on track as they migrate. Whales, which swim in the open ocean, cannot rely on land features; they could, however, rely on stars at night to provide them with external signs by which to maintain direction over long distances.

Third, humpback whales exhibit an unusual behavior: they are sometimes observed floating straight up for minutes at a time, their heads above the water as though they were looking upward. The behavior is known as spy-hopping, and it is very rare among marine animals. One explanation for the function of spy-hopping is that the whales are looking at the stars, which are providing them with information to navigate by.

单词与表达整理

  • humpback whales n. 座头鲸
  • mating n. 交配
  • manage to do 成功做…
  • puzzling adj. 使迷惑的;使莫名其妙的
  • sailor n. 水手
  • distinct adj. 明显的;清楚的
  • complexity n. 复杂性
  • determiner n. 限定词;决定因素
  • exceed v. 胜过;超过
  • cognitive adj. 认知的,认识的
  • sound adj. 合理的;可靠的
  • sensory stimuli 感官刺激
  • orientation n. 定向
  • orientation 只是在。。。的时候
  • external adj. 外部的;表面的
  • terrestrial adj. 陆生的
  • rely on 依赖;依靠
  • Land feature 地貌
  • exhibit v. 显示
  • at a time 在某时
  • as though 好像
  • rare adj. 少见的;稀有的

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