http://news.nationalgeographic.com/n...ve-birth-eggs/
^ Pretty cool stuff. An Australian Lizard species is transitioning from laying eggs to giving birth. And it's happening before our eyes!
"Now we can see that the uterus secretes calcium that becomes incorporated into the embryo—it's basically the early stages of the evolution of a placenta in reptiles," Stewart explained.In general, the results suggest the move from egg-laying to live birth in reptiles is fairly common—at least in historic terms—because it's relatively easy to make the switch, Stewart said.


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