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.

人类和其他哺血可能红，但比如章鱼血，眼斑雪冰鱼血完全透明，而在巴布亚新几内亚，它们血绿。