It is cool. Though why the article is treating it as if it's a "missing evolution in action link" confuse me... based on the fact that we know other lizards already do that. I mean, why aren't they studying the other lizards?
That is sufficiently badass though. I'm curious as if it's really an evolutionary difference in general or a physiological "choice".
First thing I'd do is capture 10 or 12 of them in the south and have 10 or 12 of them caught by a scientist in the north, and swap them and observe them in a constructed enviroment. Will they change the ways they give birth, or will the northenrn mountain lizards in the south still give birth via live birth.