They spend much of their time on the ground so as to creep up on animals, so they often get crushed to death. The mortality rate is more than 50 percent, and is especially high among young vampires going out for their first bite.
它們花很多時間在地上，悄悄接近獵物，卻因此常被踩死，死亡率高達百分之五十以上，尤其是那些初學覓食的年輕蝙蝠。