It may be red in humans and in other mammals, but octopus, for example, have blue blood and ocellated ice fish have blood that is completely clear, and in Papua New Guinea, they are green-blooded shanks.

类和其他哺乳动物可能是红色，但比如章是蓝色，眼斑雪冰是完全透明，而在巴布亚新几内亚，它们是绿色。