#7. Tsetse Fly
Tsetse, sometimes spelled tzetze and also known as tik-tik flies, are large biting flies that inhabit much of tropical Africa. Tsetse flies include all the species in the genus Glossina. Sleeping sickness is most commonly spread through the bite of an infected tsetse fly. They usually bite during the daytime and their bites are usually quite painful. A human becomes infected with Trypanosoma brucei parasites when an infected tsetse fly feeds on his or her blood.