But altruism does not exist only in humans : it has been observed in woodpeckers leafcutter ants and vampire bats .

但利他行为并不是人类的专利，啄木鸟、切叶蚁和 吸血 蝙蝠都有利他行为。

Despite what you see in the movies vampire bats almost never drink human blood .

尽管你会在电影里看到， 吸血 蝙蝠几乎从来不吸人的血。

The other vampire bats came around and asked him how he got so much blood .

其他 吸血 蝙蝠围过来，问他怎么得到这么多血。

The story of the vampire bats

吸血 蝙蝠的故事

I have killed many pests such as gnats locusts rats and even vampire bats .

我曾经扑灭过许多像蚊蚋、蝗虫、老鼠，甚至是 吸血 蝙蝠这样的坏东西。

There was a cave full of lots of vampire bats .

有一个洞穴充满了许多 吸血 蝙蝠。