スミソニアン博物館のインスタグラム(smithsonian) - 6月8日 06時24分

It's the ultimate #FossilFriday: T. rex (with a side of Triceratops). At 42 feet long and 15,400 pounds, T. rex towered over other carnivores in its ecosystem.
But those arms? 🤷‍♀️🤷‍♂️ They were too small to grab prey, although the joints and muscles were still functional, so their use remains a mystery.
In 1988, rancher Kathy Wankel discovered this Tyrannosaurus specimen while hiking on land managed by the U.S. Army Corps of Engineers. After a little digging with a garden shovel and a jackknife, she unearthed the first complete T. rex arm ever found.
Thanks to everyone who played along with our fossil detective series! 🔍 See these specimens in all their glory in @smithsoniannmnh's new #DeepTime fossil hall.

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