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Pregnant T. rex discovery sheds light on the evolution of egg laying.

Stashed in: Science!, Dinosaurs!, Birds!

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Zanno explains we now know extinct dinosaurs inherited egg laying from their ancestors, just as birds inherited this reproductive strategy from their dino ancestors.

"The discovery of medullary bone is just one more piece of evidence that blurs the line between birds and other theropod (carnivorous two-legged) dinosaurs like T. rex," she said.

Amazing that they didn't discover the medullary bone till now!

Dinosaurs really are related to birds not reptiles. Fascinating.

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