Because T. Rex's tiny arms are a sign of strength.
Let me explain.
When T. rex was described in the early part of the last century, it was the biggest meat eater that had ever been seen, and it’s still the biggest. It’s huge, with this ferocious bite. Paleontologists who have looked at the biomechanics of the T. rex jaw believe it has the most powerful bite force of any animal on land.
There are all these memes making fun of its puny little arms—the joke is that T. rex can’t put on its hat, clap its hands or wipe its bum.
But to have a strong bite, you need big, powerful jaw muscles. To have these, you need a big head, so the muscles can attach. If you have a big head, you also need big neck muscles to support that head. But you can’t have a big head and big arms—neck and arm muscles compete for muscle attachment space across the bones of the shoulder. The puny little arms that people make fun of are one of the keys to the power and ferocity of this amazing animal.
Footnotes :
http://news.nationalgeographic.com/2017/09/dinosaurs-matter-paleontology-science-kenneth-lacovara/
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