So much as is known, North American pink-tailed hawks have preyed upon nine species of amphibian, 4 of which are toads. One other bigger species, the tough-legged buzzard, generally nests considerably north of the breeding vary of pink-tailed hawks. In a single occasion, a red-tailed hawk failed to kill a healthy drake purple-breasted merganser (Mergus serrator), with this duck estimated to weigh 1,100 g (2.