After thinking about Joe's point about separating predators and prey in the mammal category; Why in the past where fish separated ? between warm water and cold water? or salmonoids? Special category for Bass? Why where birds separated? between waterfowl and upland? now turkeys? If you follow that pattern mammals should be separated. Maybe???? African vs NorthAmerican. A special category for just cats? Or Rodents? or Canines? Or like Joe said predator and prey?