The abundance of predatory and scavenger arthropod fauna in three age classes of accumulating bovine excrement was recorded in a 13-month study in southern Uganda (0° 25' N. lat.). These fauna consisted of 16 families of Coleoptera, 3 of Hemiptera, and 1 each of Dermaptera, Hymenoptera, Acarina, and Pseudoscorpiones. The Hydrophilidae and Staphylinidae comprised 60.8% of collected individuals, whereas 18.2% were Scarabaeidae, 6.3% were Scydmaenidae, and 5.7% were Histeridae. At least 94 species were found, the majority of which probably are endemic to east Africa. The greatest predator and scavenger biomass inhabited 1- to 8-day-old excrement, which also possessed eggs and larvae of the fliesMusca domesticaL. andStomoxys calcitrans(L.).