They have warm blood and they breathe air through a hole in

They have warm blood and they breathe air through a hole in the top of their head他们有温暖的血液,他们通过在他们的头上的一个洞呼吸空气。这里have warm blood 解释成有温暖的血液貌似不大妥当,如果上下文照应的话,可以翻译成输血或者流血。