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The T-rex weigh 7-8 tons, and yet its arms are smaller than toothpicks. Theire arms are so short that they cant even reach their own mouth

What did they use them for?

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Playing the accordion.

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You sir are a master of comedy.
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awesome joke! i have the image in head now, and it is the most ridiculous thing i have ever imagined! just awesome!
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They used it for grabbing and holding down prey to eat/kill it

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they used them to help keep their balance and it was used as a counterweight for the upper half of their body. It helps keep them more mobile

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that must be a fine balance if you ask me. imagine the weight of a feather, and then divide it by hundred. there you have the weight of the t-rex arms!
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It is because they havnt a confirmed use for arms....

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