Donnie with whale skeletons, giant sloth, megladon and Acrocanthosaurus (the terror of the south). The dino by itself is Willo, the fossil of a small, plant-eating Thescelosaurus, was found with an odd, iron-stained lump in its chest cavity. Medical imaging devices revealed this lump to be a fossilized heart with four chambers and a single aorta.
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