Montes de Oca worked as a naturalist on the Mexican-Guatemalan Boundary Commission and collected many plant specimens which are now in the herbarium of the National Autonomous University of Mexico (MEXU). He collected throughout Mexico, including Soconusco (Chiapas), Oaxaca, Puebla and Xalapa (Veracruz). However, it is his work with Mexican hummingbirds that gained him popularity among the scientific and artistic communities.
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