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Lizards pull a wheelie


Thanks to The Company of Biologists for this article.

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Comments
Dan Mayers

Guest Comment
Fri, Jun 13, 2008, 1:18 pm CDT
I was taught by a UC Davis Professor (R. Cohen) years ago (2001) that this behavior is an adaptation to a respiratory system not designed for fast, sustained quadrupedal motion. His argument was that due to the leg structure of a lizard, walking required a "body bend" because their shoulders have a very limited range of motion. In other words, lizards cat reach very far forward with their legs. To make up for this limited joint mobility lizards will bend their bodies. This presents a problem for sustained speed because the "body bend" would essentially alternately decrease the volume of one of their lungs, thus decreasing the lizards overall locomotive efficiency. You can observe this by watching common fence lizards run in short spurts.

So... to combat this, several species have evolved the behavior of running on their hind legs thus negating the "body bend" and increasing their overall efficiency.

In reading this article I found it surprising that there is no phylogenetic correlation of this behavior, but I cant really speak to that.

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