保里洛说，河马有时会保护其他动物免受鳄鱼的伤害。
Paolillo says hippos sometimes protect other animals from crocodiles.
对能量使用表现得很“节俭”的动物变得非常长寿，比如鳄鱼和龟类。
Animals which behave "frugally" with energy become particularly old, for example, crocodiles and tortoises.
如果这是真的，那么为什么像蛇、蜥蜴、乌龟和鳄鱼这样的冷血动物能在寒冷的冬天和炎热的夏天存活下来呢？
If true, though, why did cold-blooded animals such as snakes, lizards, turtles, and crocodiles survive the freezing winters and torrid summers?
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