Hummingbirds in high alpine habitats of the tropical Mexican mountains: new elevational records and ecological considerations by Libertad Arredondo-Amezcua, Silvana Martén-Rodríguez, Martha Lopezaraiza-Mikel, Carlos A. Gutiérrez-Chávez, Erandi Ramírez-Aguirre, Roberto Sáyago-Lorenzana, María del Coro-Arizmendi, Mauricio Quesada

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