 Different species (and breeds) of livestock do not all graze in the same way, and this is also taken into account when deciding the appropriate number of units for grazing land.For example, horses naturally graze unevenly, eating short grass areas first and only grazing longer turf if there is insufficient short grass; cattle graze longer grass preferentially, tending to produce a uniform sward; goats tend to browse shrubs if these are available.As these feeding styles are complementary, a pasture may therefore support slightly more units of mixed species than of each species separately.