Fig. 5. Morphological differences between jaws of cichlids. (A) The river-dwelling cichlid Metriaclima zebra (left) has a jaw structure (right) that is well-suited for sucking. (B) The Great Lakes cichlid Labeotropheus fuelleborni (left) has a jaw structure (right) that is well-suited for biting. Photographs of Labeotropheus fuelleborni and Metriaclima zebra courtesy of J. Dion and F. Hagblom, respectively. Drawings reproduced, with permission, from Albertson et al. (Albertson et al., 2003a).