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Pterosaurs were an ancient group of winged reptiles that lived alongside the dinosaurs. Many pterosaurs were very large, some as large as a giraffe and with a wingspan of over 12 meters. Paleontologists have long wondered whether large pterosaurs were capable of powered flight (flying by flapping their wings) or whether they were able only to glide. Several arguments have been made against powered flight.

Doubters point out that since modern reptiles are cold-blooded, ancient reptiles such as pterosaurs were probably cold-blooded as well. Cold-blooded animals typically have a slow metabolism and are unable to produce a lot of energy. Powered flight is an activity requiring a lot of energy, which is why all modern vertebrates that fly are warm-blooded, not cold-blooded. It seemed unlikely that pterosaurs would have been able to generate the energy needed to fly.

Second, there is a limit to the weight of animals that can be kept airborne by powered flight. Pterosaurs that were as large as a giraffe were probably so heavy that they would not have been able to flap their wings fast enough to stay aloft for any length of time.

Third, all animals with powered flight are able to take off from the ground. For example, birds take off by jumping from their legs or running to gain speed and then jumping. But these methods would not have worked for large pterosaurs. Large pterosaurs would have needed big, powerful muscles in their back legs to launch themselves into the air, and we know from fossilized bones that their back leg muscles were too small and weak to allow the pterosaurs to run fast enough or jump high enough to launch themselves into the air.

生词与表达整理

  • pterosaurs n. 翼手龙
  • winged adj. 有翼的;飞行的
  • reptiles n. 爬行动物;爬虫类
  • alongside prep. 在…旁边
  • As large as 和…一样大
  • wingspan n. 翼展;翼幅
  • paleontologist n. 古生物学者
  • be capable of 能够
  • glide v. 滑行;滑翔
  • powered flight 动力飞行
  • doubter n. 怀疑论者
  • point out 指出
  • metabolism n. 新陈代谢
  • vertebrate n. 脊椎动物
  • It seemed unlikely that … 看起来不可能。。。
  • generate v. 产生;使形成
  • airborne adj. 在空中的;在飞行中的
  • stay aloft 维持飞行
  • take off 起飞;脱下;离开

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