Tsetse Fly (IMAGE) Stellenbosch University Caption Tsetse flies are bloodsucking insects that carry the trypanosome parasite which causes sleeping sickness in humans. They occur exclusively in sub-Sahara Africa. Credit Judy Gallagher CC BY 2.0 <a target="_blank" href="https://www.flickr.com/photos/52450054@N04/42453576002">https://www.flickr.com/photos/52450054@N04/42453576002</a> Usage Restrictions Judy Gallagher CC BY 2.0 <a target="_blank" href="https://www.flickr.com/photos/52450054@N04/42453576002">https://www.flickr.com/photos/52450054@N04/42453576002</a> License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.