oxpeckers feed exclusively on the backs of large mammals. certain species seem preferred, whereas others, like the lichtenstein's hartebeest or topi are generally avoided. the smallest regularly used species is the impala, probably because of the heavy tick load and social nature of that species. in many parts of their range they now feed on cattle, but avoid camels. they feed on ectoparasites, particularly ticks, as well as insects infecting wounds and the flesh and blood of some wounds as well.