And what all of them had in common was that as they slept, they'd all been bitten by the only mammal that lives exclusively on a diet of blood: the vampire bat.
그들의 공통점은 수면을 취하다, 유일하게 피를 먹고 사는 포유류에게  물렸다는 겁니다. 바로 흡혈박쥐입니다.