There has been much speculation about why some dinosaurs had small arms. The unearthing of a well-preserved relation of the T-rex has shed more light on the species.
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Fossil of new dinosaur with short forearms suggests they could have provided grip while mating
Newly discovered dinosaur has tiny arms like a T. rex – but the two species lived 20 million years apart - BBC Science Focus Magazine
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What Is Going On With T. Rex's Short Arms? » Science ABC
