Leg position and movement
There is a connection between endothermy and the position and movement of the legs. The physiology of endothermy allows sustained physical activity, such as running. But running is efficient only if an animals legs are positioned underneath its body, not at the bodys side, as they are for crocodiles and many lizards. The legs of all modern endotherms are underneath the body, and so were the legs of dinosaurs. This strongly suggests that dinosaurs were endotherms.
腿的位置和运动方式
恒温动物和腿的位置及运动方式有一定联系。恒温动物的生理结构允许它们进行持续的物理运动,比如奔跑。但是,只有当腿长在身体的下部而不是两侧的时候才能快速地奔跑,而像鳄鱼或者很多蜥蜴的腿,都是长在身体两侧的。所有现代恒温动物的腿都是长在身体下部的,而恐龙的腿也具有同样的特点。这很有力地说明了恐龙是恒温动物。
Haversian canals
There is also a connection between endothermy and bone structure. The bones of endotherms usually include structures called Haversian canals. These canals house nerves and blood vessels that allow the living animal to grow quickly; and rapid body growth is in fact a characteristic of endothermy. The presence of Haversian canals in bone is a strong indicator that the animal is an endotherm, and fossilized bones of dinosaurs are usually dense with Haversian canals.
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