Clues to fossil mammals' diets come from teeth,skull shape, from fossil dung and gut contents, from lab analysis of isotopes in bone and teeth, and by looking at diets of similar modern animals. Microscopic viewing of wear on teeth offer direct evidence of the diet's impact on tough enamel. Lab analysis of oxygen, carbon, and nitrogen isotopes in bone and teeth yield state-of-the-art insight into the plants and animals ate. Isotopes help describe even the soils and water in a long-gone ecosystem.
Pronghorn often suggested as possible diet options for the extinct American cheetah.
Associated fossils with Miracinonyx at Natural Trap Cave in Wyoming (Martin et al 1979)
A model for the feeding ecology of the Grand Canyon population of M. trumani proposed by Hodnett (2010)
Martin et al (1979)
Valkenburgh et al (1990)