The vector that transmits Trypanosomes is the tsetse fly. Trypanosomes are parasites that can cause diseases such as sleeping sickness in humans and nagana in animals. Tsetse flies are found in sub-Saharan Africa and are the only insects that can transmit Trypanosomes. When a tsetse fly bites an infected animal or person, it ingests the Trypanosomes along with their blood. The parasites then multiply and develop in the fly's gut before being transmitted to a new host when the fly feeds again. Tsetse fly control is important in areas where these parasites are prevalent, as it can help to reduce the incidence of Trypanosome-related diseases. Butterfly, housefly, and mosquito are not known to transmit Trypanosomes.