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B2 ScienceOct 9, 2026

How smart were T. Rex? | Steve Brusatte

T.レックスはどれほど賢かったのか? | スティーブ・ブルサッテ

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Translation

In the first Jurassic Park, we see this storyline that if you stand still, the T.
最初の『ジュラシック・パーク』では、じっと立っていれば、T.
Rex cannot sense you.
レックスには気づかれない、という展開が見られます。
Now, in reality, you would be bait because it had a pretty big brain for a reptilian creature of its body size.
しかし実際には、体の大きさの割に爬虫類としてはかなり大きな脳を持っていたので、餌食になるでしょう。
Its brain had big olfactory bulbs that controlled a very powerful sense of smell, big optic lobes that powered keen vision, and ear with a really long cochlea.
その脳には、非常に強力な嗅覚を司る大きな嗅球、鋭い視覚を支える大きな視葉、そしてとても長い蝸牛を持つ耳がありました。
And we know from modern animals, the longer the cochlea, the greater range of sounds you can hear.
そして現代の動物から分かっているように、蝸牛が長いほど、聞き取れる音の範囲が広くなります。
So T.
だからT.
Rex was a smart animal, and we can tell from the fossils that some of the ancestors of T.
レックスは賢い動物でした、そして化石から分かるのは、T.の祖先の一部が、
Rex, while they were still small, while they were still the size of humans and horses, it was then that they were developing these larger brains and keener senses.
レックスがまだ小さく、まだ人間や馬ほどの大きさだった頃、その頃にこれらの大きな脳と鋭い感覚を発達させていたということです。
So it seems that being smart may have helped tyrannosaurs this Middle Cretaceous extinction.
ですから、賢かったことがティラノサウルスがこの白亜紀中期の絶滅を生き延びる助けになったのかもしれません。

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