At first, all four legged vertebrates were ectothermic, their body temperature changed according to their surroundings.

一开始所有的四脚脊椎动物都是冷血动物，它们的体温随着周围的环境变化着。

Most animals are ectothermic, they don't produce enough internal heat to stay warmer than their environment.

大部分动物都是外温动物，它们体内不会产生足以使体温高于环境温度的热量。

And the hedgehog tenrec, an adorable little mammal found in madagascar, is essentially ectothermic or cold-blooded when it's not breeding.

还有多刺无尾渭，一种发现于马达加斯加的可爱小型哺乳动物，在它不生育的时候就是完全的外温或者说冷血动物。

What we think is that these guys are basically just ectothermic animals.

我们认为这些家伙基本上只是变温动物。

Although turtles as a group are considered ectothermic.

虽然海龟作为一个群体被认为是放温动物。

All reptiles are ectothermic, so they need heat from an outside source to stay warm.

所有爬行动物都是变温动物，因此它们需要从外部来源获取热量来保持温暖。

So some dinosaurs appear to have endothermic traits, while others have signs of being ectothermic.

因此，一些恐龙似乎具有吸热特性，而另一些则具有变温的迹象。

Dinosaurs most definitely came from an ectothermic ancestor, just like mammals did.

就像哺乳动物一样，恐龙绝对来自变温祖先。

So even though most animals today are either one or the other, dinosaurs were probably somewhere in between – some dinosaurs were more ectothermic, while others were more endothermic.

因此，尽管今天的大多数动物都是其中之一，恐龙可能介于两者之间 - 一些恐龙更具变温性，而另一些则更具吸热性。

When we look through a thin section of dinosaur bone, the pattern of these osteons looks more like that found in endothermic animals rather than that found in ectothermic animals.

当我们透过一块薄薄的恐龙骨头观察时，这些骨元的模式看起来更像是在吸热动物中发现的，而不是在变温动物中发现的。