Sampling sites and body size variation in Rhamphochromis cichlid fish species. (A) Map of Lake Kingiri, Lake Chilingali, and Lake Malawi. Lake Kingiri has a diameter of ∼600 m, and Lake Chilingali has a length of ∼5.1 km. (B–D) Pictures from the shoreline of Lake Kingiri (B), Lake Chilingali (C), and Lake Malawi (D). (E) Variation of standard length and images across each of the 15 Rhamphochromis cichlid fish species. Relative scaling of fish pictures is to their approximate body sizes. The map of Africa is generated using data from GEBCO (https://www.gebco.net/) and Hydrolakes (https://www.hydrosheds.org/products/hydrolakes). Lake outlines redrawn from OpenStreetMap (© OpenStreetMap contributors, available under Open Database License ODbL).