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The aim of this study is to determine the feeding habits and home range of fossil horses ( Equus conversidens  and  E. mexicanus ) from La Presita Blanca, San Luis Potosí, central México. For this purpose, we used carbon, oxygen, and strontium isotope ratios. We compared  87 Sr/ 86 Sr from horses with strontium ratios of La Presita Blanca plants and soils to identify if these animals were local or came from elsewhere. The δ 13 C values indicate that  E. conversidens  specimen consumed C 4  plants and  E. mexicanus  was a mixed feeder. In this case, carbon isotopic values reflect only the animal’s feeding preferences and not the type of vegetation that existed in La Presita Blanca during the Pleistocene. Furthermore, δ 18 O values and strontium isotopic ratios show that  E. conversidens  was an animal that could be local to the Campo Volcánico de San Luis Potosí whereas  E. mexicanu s came from another region.

Feeding habits and mobility of Equus conversidens and E. mexicanus from La Presita Blanca, State of San Luis Potosí, México