And an associated story that was reported down here recently: 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. Evolution in Action: Lizard Moving From Eggs to Live Birth
The shells are getting thinner and thinnner and eventually become just a membrane. "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.
A classic case of evolution in action. And there's me been saying all this time that it happens too slowly to see. I may have to stand corrected on that.