While hunting prey, it often takes a variety of prey usually focusing somewhat on small to medium-sized mammals, usually medium-sized to large birds and occasionally medium to large-sized reptiles. A diet analysis in Zimbabwe indicated that among 160 prey items, 36.9% were mammals, 51.9% were birds, 10% were reptiles and 1.2% were amphibians. The leading prey species here were helmeted guineafowl ("Numida meleagris"), at about 21% of the prey total, and scrub hare ("Lepus saxatilis"), at about 16% of the total. A similar dietary study conducted in Lochinvar National Park, Zambia found a higher proportion of birds and amphibians (61.4% & 5.5% respectively), with a surprisingly number of water birds being taken, largely the red-knobbed coot ("Fulica cristata") and the African pygmy goose ("Nettapus auritus"). The variation in diet between the preceding two study sites is due to differences in habitat and prey availability. A very detailed study was conducted in Tsavo East National Park, Kenya, of the diet of the local tawny eagles over different years. Of 543 total prey items, 41.2% were mammals, 35.4% were birds, and 23.4% were reptiles and amphibians. Of these the most important prey was Kirk's dik-dik ("Madoqua kirkii") at 21.7% of the total, yellow-necked spurfowl ("Pternistis leucoscepus") at 6.8% of the total, cape hare ("Lepus capensis") and crested francolin ("Dendroperdix sephaena") both at 6.3% and red-crested korhaan ("Lophotis ruficrista") at 5.9%; additionally, unidentified snakes constituted 21.3% of the foods. The dik-dik is a small antelope and is much larger than a tawny eagle. The tawny eagle certainly took dik-diks weighing up to and possibly even , with this eagle taking about 80 dik-diks in Tsavo East each year. In different areas of South Africa, small dietary studies determined the diet at nests to be highly variable. In the Highveld, about 52% of 60 prey items were mammals, 45% were birds and a small amount were fish.