At a talk by Walter Auffenburg I attended early in my Reptile intrest He said "Reptiles, it is all about math." I said to myself, oh no first Latin, now Math. I'm not sure if i'm realy going to like this! Well, I stayed at it, noted the weight and size and temps. of every reptile and eggs I've ever had. It tells a very important story at some point. It is the key to understanding reptiles. Tortoises are the most Mathematical cognative reptile in my opinion. VM