The deadliest animal in the world is the anopheles mosquito, which can carry malaria. According to the Centers for Disease Control, malaria killed nearly 700,000 people and sickened about 220 million people around the world in 2010.
There are more than 400 types of anopheles mosquitoes, and about 40 are able to transmit the plasmodium protozoan that causes malaria. The mosquitoes are not infected until they bite a person who already has malaria. Then, the insect spreads the disease to other people.
Only the female anopheles mosquitoes bite and suck blood. These female mosquitoes can lay viable eggs only after a blood meal.