A pack of 19–29 African wild dogs (Lycaon pictus) in the Masai Mara area of Kenya was monitored during July–August 1989 to document their success in capturing various ungulate species. The pack was most successful killing smaller, abundant ungulate prey, and was not less successful when pack size abruptly was reduced; overall hunting success (all species) was 51%. Abundant prey, low competition with other large carnivores, and large size of pack confound conjecture concerning the evolution of pack size.