"Early Dinosaurs and Prehistoric Sea Monsters Laid" Topic
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Tango01  | 17 Jun 2020 2:54 p.m. PST |
…Squishy Eggs "New research suggests early dinosaurs laid eggs with soft shells, and mosasaurs—gigantic marine reptiles—did so, too, laying soft-shelled eggs of massive proportions. Birds and crocodiles lay eggs with hard, heavily calcified shells, while most lizards, snakes, and turtles lay eggs that are soft and leathery. Soft-shelled eggs appeared first, but paleontologists have struggled to understand the evolutionary transition from soft to hard egg shells. As you can probably guess, soft shells don't preserve well, and very few exist in the fossil record…."
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