WordbookGet the appGet app

0:00 / 1:27Line 1 of 18

B2 ScienceOct 16, 2026

Why are T. Rex arms so pathetic? | Steve Brusatte

なぜT.レックスの腕はあんなに貧弱なのか？｜スティーブ・ブルサッテ

Big Think1 video Open on YouTube

Transcript

18 lines

0 learning0 looked up0 known123 new

Translation

T-Rex was the size of a bus, head the size of a bathtub, fifty banana-sized teeth in his mouth.
Tレックスはバスほどの大きさで、頭はバスタブほどの大きさ、口にはバナナサイズの歯が50本ありました。
It could crush the bones of its prey.
獲物の骨を砕くことができました。
But its arms were the size of my arms, and my arms are not that big.
でもその腕は私の腕ほどの大きさで、私の腕はそんなに大きくありません。
So how could such an incredible, sublime animal have such pathetic arms?
では、なぜそんなに信じられないほど素晴らしい動物が、そんなにみすぼらしい腕を持っていたのでしょうか？
It is a riddle that goes back to the discovery of T-Rex in the early 1900s,
それは1900年代初頭のTレックス発見にさかのぼる謎であり、
and we don't honestly know for sure why the arms were so small.
なぜ腕がそんなに小さかったのか、正直なところ確かには分かっていません。
But we have a pretty good idea.
でも、かなり良い考えはあります。
Those arms of T-Rex were very muscular, much, much, much more muscular than my arms,
Tレックスの腕は非常に筋肉質で、私の腕よりもずっと、ずっと、ずっと筋肉質でした、
and we can tell because muscles leave scars on the bones, and those scars are huge on the T-Rex arm bones.
筋肉は骨に痕を残すので分かり、その痕はTレックスの腕の骨では巨大なのです。
Now the muscles that were really big on the T-Rex arms were the ones that would have brought them closer to the body, like this.
Tレックスの腕で本当に大きかった筋肉は、こんなふうに体に引き寄せる筋肉でした。
So that motion must have been something that they were doing.
だから、その動きは彼らがしていた何かだったに違いありません。
Quite regularly, that was important to them, and we can speculate.
かなり定期的に、それは彼らにとって重要だったのです、推測できます。
Maybe they were holding onto each other when they were mating.
交尾のときにお互いにしがみついていたのかもしれません。
Maybe when they were feeding with their mouths, they were bracing themselves with their arms.
口で餌を食べるとき、腕で体を支えていたのかもしれません。
Or maybe, if they were two T.
あるいは、もし2頭のTがいたら。
rexes that were fighting over a kill, they could wrestle, grapple with their arms a little bit.
獲物をめぐって争うレックスたちが、腕で少しレスリングしたり組み合ったりできたのかもしれません。
There's a lot of different possibilities, but the fact that the arms are there and the arms are muscular means they must have been part of the repertoire of T.
いろいろな可能性がありますが、腕が存在し、腕が筋肉質であるという事実は、それらがTの行動レパートリーの一部だったに違いないことを意味します。
rex behavior.
レックスの行動。

Words in this video

The ones worth learning, rarest last. Tap one to hear it where it was said.

Up next

12:56Why the Perfect Red Is Impossible to MakeB2SciShow

11:124 Things We Can Learn From ExplosionsB2SciShow

15:13This Woman Cured Her Cancer with an Insane MethodB2Kurzgesagt – In a Nutshell

11:09Why Can't Every Flight Be Direct?B2SciShow

2:05What if You Could Speak Chipmunk?! 🐿️ | You Wanna Be a What?! | Nat Geo KidsB2Nat Geo Kids

1:05Heating A Ball Just By Squeezing ItB2Veritasium

12:194 Fantastic Dinosaurs! Ankylosaurus, Iguanodon, Velociraptor & Spinosaurus | Meet the DinosaursA2Little Fox - Kids Stories and Songs

Keep your words in LingoDew

The app brings the words you save back for review right before you forget them — with the clips you heard them in.

Download on theApp Store Get it onGoogle Play