Using the isotopic carbon and oxygen ratios present in dental enamel, the diet and the habitat of an individual of the Pliocene rhinoceros Teleoceras fossiger from San Francisco de los Reyes, Michoacán, México, were inferred. The values of δ¹³C and δ¹⁸O indicate that this animal fed on C₃ plants and lived in enclosed areas similar to those found in some Florida specimens. However, because only one specimen was analyzed, it is not possible to determine if these rhinoceroses in Mexico were specialists or generalists in their diet.