To investigate dietary differences in two coexisting competing predators, we determined prey consumed by bobcats (Lynx rufus) and coyotes (Canis latrans) from scats in the Izta-Popo National Park, central Mexico. Use of prey by bobcats and coyotes showed a Pianka's index of overlap of 0.94, much higher than in other studies of the diet of these two species. Diets of bobcats were comprised primarily of eastern cottontail (Sylvilagus floridanus, 33.7%), rodents (22.7%), Mexican cottontail (S. cunicularius, 13.1%), the endemic and endangered volcano rabbit (Romerolagus diazi, 12.5%), Merriam's pocket gopher (Pappogeomys merriani, 9.3%), and long-tailed partridge (Dendrortyx macroura, 1.4%). Prey used by coyotes included primarily eastern cottontail (43.8%), rodents (15.7%), Mexican cottontail (12.0%), Merriam's pocket gopher (6.4%), and volcano rabbit (5.5%).