What is the fastest animal in the world?
（陸上なら）チーターですよね。
じゃあ、二足歩行で一番速いのは？
二足歩行をする動物自体が少ないなぁ。
鳥類と哺乳類のごく一部。
やっぱダチョウ？
60km/h
カンガルー？
70km/h
ちなみに人類最速のボルトは37km/h
もっと遡ってみますと、遥か昔に二足歩行のすごい奴らがいました。
恐竜。
獣脚類のオルニトミムスあたりは時速80キロほどで走れたらしいです。
オスニエリアはそれ以上。
時速100キロをこえるチーターたちにはかなわなかったようですが時速90キロくらいとか。
こちらは、最近発見された獣脚類。
まだ研究中で、名前がありません。
すべての獣脚類の祖先と考えられる古いタイプの恐竜で、同時代の恐竜（三畳紀後期）の中では最も足が速かったと考えられています。
まだまだ知らないことだらけの地球の歴史。
もしかしたら、チーターより速い動物がいたかもしれません。
サメやワニは、生存競争の中で最高の進化をしているといわれる事があります。
長い間ほとんど姿を変えずにいるため、水中で最も適応した生物だと考えられるからです。
その祖先が恐竜時代にはすでに出現していました。
知らない時代に、驚くような脚力を身につけた動物がいたって不思議じゃない気がしてきます。
ちなみに、写真は国立科学博物館に展示されている新種の恐竜です。
3月から、ゴンドワナの支配者達がきてます。
太古の地球にはゴンドワナという大陸があって、分裂と移動の繰り返しで、現在の南米、オーストラリア、アフリカ、南極、インドなどに形をかえていったそうです。
氷の大陸、南極で発見された恐竜など、未発見だった新種が多いので好奇心が刺激されます。
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