Vampire bats specialized in drawing blood from sleeping victims without waking them. It is rare for them to find human targets, but it happens sometimes: https

Vampire bats specialized in drawing blood from sleeping victims without waking them. It is rare for them to find human targets, but it happens sometimes: https://en.wikipedia.org/wiki/Vampire_bat#Human_health https://en.wikipedia.org/wiki/Vampire_bat#Human_health