Bloodsucker

Bloodsucker is any of the insects or other animals that sucks other animal's blood, such as a mosquito, bed-bug, or a leech. A person who lives on other person's money or extorts money from others is also called a bloodsucker.

Bloodsucker is also an arboreal Asian lizard. It has long tail and keeps its head in a raised position. It is known for its ability to change colour, most remarkably the males, when excited the colour of its head and shoulders become bright red.