The Tsetse Fly
Tsetse flies are large, biting flies that can be found in the tropical parts of Africa. Considered as holoparasites, these flies feed on the blood of animals. The Tsetse fly spreads a parasite that can cause African trypanosomiasis or sleeping sickness, which starts out with painful joints, fever, itching, and headaches. Over time, it causes neurological symptoms such as disruption of sleep cycle, tremors, and muscle weakness, as well as psychological indications like psychosis and aggressive behavior.