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Biology

The Evolutionary Transitions Between Oviparity and Viviparity in Squamate Reptiles

Quick fact

Squamate reptiles (lizards and snakes) have independently evolved live birth more than 100 times, far more than any other vertebrate group, providing a unique natural experiment in how major reproductive transitions happen.

Why this is interesting

Lizards and snakes are famous for laying eggs, but did you know that about 20% of them give birth to live young—and that this has evolved over a hundred separate times? How does a reptile lose its eggshell and start carrying babies inside?

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