Mosquitoes have four teeth that are sharp and serrated. They are arranged around two tubes. One releases a pain suppressor into the insect's victim, as well as an anticoagulant to keep the blood from clotting. The other tube draws out the blood. Only female mosquitoes feed on blood.
Typically, after jabbing the victim's skin with her snout, the mosquito cuts into the skin with her teeth to reach the blood vessels. By the end of the meal, a mosquito has often doubled her weight, and she may be unable to fly. Most adult mosquitoes live only two to four weeks. During that period, they feed on blood one to three times.