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なぜ飛べない鳥が存在するのか？
2,283,718 views |
ジリアン・ギブ |
TED-Ed
• October 2018
Read transcript
現代の鳥類の共通の祖先はみな空を飛べたのに、多くの鳥類がそれぞれに飛ぶ能力を失っています。飛ぶことには素晴らしい利点があります。特に捕食動物から逃げたり、狩りをしたり、長距離を移動したりする時です。一方で、高い代償も伴います。大量のエネルギーを消費しますし、体の大きさや重さが制限されることです。ジリアン・ギブが飛べない鳥たちは、なぜ飛ぶ力を無くしたのかについて調査します。 講師：ジリアン・ギブ 監督：アントン・ボガティ
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