What kind of bug attacks with a sharp beak to suck out body fluids?

A mosquito is an example of a bug that attacks with sharp mouthparts to get body fluids.

Specifically, a mosquito is grouped among the insects which have piercing, sucking mouthparts. Its mouthparts have to be sharp and strong enough to puncture the skin when it lands on a human. The mosquito may be said to prey upon humans in order to feast upon such human body fluids as blood in order to survive.