These images form a picture book explaining the part played by the tse tse fly in spreading parasites among people and livestock in sub-Saharan Africa. I received valuable help and information from Rachel Hutchinson at the University of Bristol which enabled me to write this book. This was just one project among 35 artist/scientist pairings brought about by the 'Creative Reactions' team, as part of the annual 'Pint of Science' project.