The Odd Blog

And when our cubs grow / We'll show you what war is good for

An Evolutionary Snapshot

Posted by That Other Mike on 02/09/2010

Evolution in Action: Lizard Moving From Eggs to Live Birth

Brian Handwerk
for National Geographic News
Published September 1, 2010

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.

Amazing stuff – go and read the rest at

Some of the comments are fairly depressing, though. Why is it that people who obviously have no understanding of evolution whatsoever persist in insisting that they know so much more and better than people who actually study it for a living?

Nevermind, though; this is fascinating news.


2 Responses to “An Evolutionary Snapshot”

  1. magsx2 said

    I read Nationl Geographic a bit, and did read this story. I found it very interesting, especially were the lizards have changed from laying eggs from one area, but not in different area. Who knows how many things are changing like this, we live in a very interesting world. (I totally agree with you about the comments.)

  2. It’s very interesting stuff, and it ties in to the concept of allopatric speciation, one of the ways that speciation can take place – via geographical separation.

    Thanks for commenting!

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