Evolution in Action: Lizard Moving From Eggs to Live Birth

A yellow-bellied three-toed skink carrying embryos, visible as light orbs inside its body.

"Evolution has been caught in the act, according to scientists who are decoding how a species of Australian lizard is abandoning egg-laying in favor of live birth.

Along the warm coastal lowlands of New South Wales (map), the yellow-bellied three-toed skink lays eggs to reproduce. But individuals of the same species living in the state's higher, colder mountains are almost all giving birth to live young."