Okay, this is the kind of story I love.
Thirty years ago there were these scientists, see? And they were conducting experiments on lizards. I don’t know why. It doesn’t matter. But they took five mating pairs of a particular kind of lizard (the Italian Wall Lizard, which is a good name) from the little island that they were indigenous to and put them on another, nearby island named Pod Mrcaru (that is not a misprint), just off the Croatian coast.
The lizards weren’t supposed to be there long. Unfortunately, right around this time, the Croatian War of Independence broke out. And, you know, suddenly, everybody had more important things on their minds than ten lizards in a strange place. And they just kinda, I don’t know, forgot about them.
So, I guess somebody recently remembered and went back for the lizards. And, man, Pod Mrcaru was crawling with the little bastards. They completely took over and drove all the island’s native lizards to extinction and now the place is pretty much wallpapered with the interlopers. Which I’m sure you expected. That’s how stories like this always end: new species is introduced into an environment and grows out of control. God knows it happened back home, both with ladybugs and kudzu. I don’t know what folks were thinking when they brought kudzu to the Commonwealth.
Anyway, but that isn’t the whole story. The scientists found, when they examined the lizards, that they weren’t the same any more. For one thing, the source species eats mostly insects, which are easy to digest. But these lizards were eating mostly plants. It turns out that they have grown new organs specifically to help them digest plant matter! They grew something called a “cecal valve,” which is musculature between the stomach and intestines that holds food and essentially allows it to ferment, so that their digestive system can break down vegetation. Their heads got bigger, too, allowing for a stronger bite (presumably for tearing leaves). And their social structure changed; the new lizards aren’t as territorial as the original species, and they apparently mate somewhat more freely.
And all this happened in thirty years! According to Duncan Irshick, a biology professor at UMass, that’s like humans spontaneously growing a new appendix in a couple of centuries. Who knew it could happen so fast?
So, anyway, yeah, and the point is this: the next time some fundamentalist wacko tells you evolution is a myth and that there’s no evidence for it, ask him, “Say, have you heard about the Croatian lizards?”
Got info from the National Geographic …check it out!
Thirty years ago there were these scientists, see? And they were conducting experiments on lizards. I don’t know why. It doesn’t matter. But they took five mating pairs of a particular kind of lizard (the Italian Wall Lizard, which is a good name) from the little island that they were indigenous to and put them on another, nearby island named Pod Mrcaru (that is not a misprint), just off the Croatian coast.
The lizards weren’t supposed to be there long. Unfortunately, right around this time, the Croatian War of Independence broke out. And, you know, suddenly, everybody had more important things on their minds than ten lizards in a strange place. And they just kinda, I don’t know, forgot about them.
So, I guess somebody recently remembered and went back for the lizards. And, man, Pod Mrcaru was crawling with the little bastards. They completely took over and drove all the island’s native lizards to extinction and now the place is pretty much wallpapered with the interlopers. Which I’m sure you expected. That’s how stories like this always end: new species is introduced into an environment and grows out of control. God knows it happened back home, both with ladybugs and kudzu. I don’t know what folks were thinking when they brought kudzu to the Commonwealth.
Anyway, but that isn’t the whole story. The scientists found, when they examined the lizards, that they weren’t the same any more. For one thing, the source species eats mostly insects, which are easy to digest. But these lizards were eating mostly plants. It turns out that they have grown new organs specifically to help them digest plant matter! They grew something called a “cecal valve,” which is musculature between the stomach and intestines that holds food and essentially allows it to ferment, so that their digestive system can break down vegetation. Their heads got bigger, too, allowing for a stronger bite (presumably for tearing leaves). And their social structure changed; the new lizards aren’t as territorial as the original species, and they apparently mate somewhat more freely.
And all this happened in thirty years! According to Duncan Irshick, a biology professor at UMass, that’s like humans spontaneously growing a new appendix in a couple of centuries. Who knew it could happen so fast?
So, anyway, yeah, and the point is this: the next time some fundamentalist wacko tells you evolution is a myth and that there’s no evidence for it, ask him, “Say, have you heard about the Croatian lizards?”
Got info from the National Geographic …check it out!
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