Besides food availability, what geological factor can severely limit the presence of Xerus rutilus?

A poorly draining or overly rocky substrate

While East African *Xerus rutilus* require adequate foraging opportunities, the ultimate determinant of their precise territory edges often hinges on geological factors, specifically soil mechanics related to their burrowing needs. They rely on constructing extensive tunnel systems, which mandates a substrate that is structurally sound yet workable. If the soil possesses poor drainage capabilities, the burrows risk flooding during rains, which can be fatal. Conversely, if the substrate is overly rocky, excavation becomes prohibitively difficult or impossible, severely limiting the depth or complexity of the network they can create. Therefore, an inability to dig structures with proper drainage or one obstructed by excessive rock will restrict their presence, even if surface food resources are plentiful.