A mythical monster from Western legends that sucks people's blood; also refers to literal bloodsucking vermin or leeches.

an organism that sucks blood; a leech; a person who unfairly takes money or resources from others

the vampire squid, a deep-sea cephalopod (Vampyroteuthis infernalis)

an organism that sucks blood, such as a schistosome; a blood-sucking worm