Snake and lizard ancestor may have birthed live young

By Ashley Yeager, 17:25 PM December 17, 2013

Instead of laying eggs, the ancestor of lizards and snakes may have given birth to live young. That could mean that, over the course of millions of years, these reptiles have switched back and forth between the two reporduction methods, researchers report in the January Ecology Letters.

Scientists had thought that the ancestor of snakes and lizards was oviparous, and that if a species converted to birthing live young, it would never switch back.

Fossil evidence, however, supports the idea that ...

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