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Description
Plesiopterys ,one of the member in Plesiosaur, finding some stone under a bed sea and eat them for to be a Gastroliths.
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"Having a lungful of air presents all marine reptiles with a buoyancy problem. Plesiopterys has found one solution. He is not looking for food in the sand, he is in fact after pebbles and grit. Sieving off the fine grains, he retains the larger stones in his stomach for ballast, which weighs him down and counteracts the air in his lungs."