The act of predation is defined here to include the behavior of insectivores. By examining the behavior of a set of morphologically conservative mammals, a common pattern of prey capture can be identified. Mammals with a conservative morphology and that are active predators may have similar bite efficiencies. Acts of predation in nature are only rarely documented and researchers are often constrained by dependence on indirect evidence and captive studies. Remarkable instances of convergence in the form and function of predators are discernible even when different phylogenetic lines are compared. Some marsupials demonstrate patterns of predatory behavior that are comparable to placentals.