The Narok District has undergone rapid changes in land use patterns from nomadic pastoralism to a sedentary and farming lifestyle. In this study we describe wildlife and livestock numbers and past and present land-use patterns in three group ranches from 1975 to 1997. The purpose of this paper is to examine the effect of land-use changes on herbivore populations. Research methods included observation and interpretation of satellite imageries and aerial photographs, field checks, participant observation and secondary data. Results indicate