The vampire bat feeds mainly on the blood of cattle, horses, and wild mammals such as deer and peccaries. It seldom bites humans. When feeding it chooses to land near a hairless area of thin skin -- ...

When a vampire bat bites its victim, it secretes DSPA. This destroys fibrin, which helps blood clot. During the mid-1980s, it emerged that the vampire bat enzyme was genetically related to tissue ...