Has anyone noticed?

It's in the script 

Turtles are not only incredibly strong, they're incredibly fast for the weight on their shoulders as well as some of the fastest swimmers in the reptile world. Tortoises, on the other hand are slow but have thicker shells for protection. But overall turtles are wrongly stereotyped as slow. I would know. I've had plenty. Snapping turtles, red eared sliders, I currently have a red footed tortoise and have have Russian tortoises before. Again, wrongly termed "slow" even my tortoises could walk across my lawn pretty fast.

I saw a snapping turtle lay an egg once. One time my dad picked up a box turtle and it peed on his foot. He was wearing sandels. It was funny as hell! But I never knew they were stereotyped as slow. No wonder Gamera is so fast, he's getting back at that stereotype.