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  1. By: Gutiérrez, Ralph J. - Hunter, John E - Chávez León, Gilberto - Price, John
    Type: Article
    In: The journal of raptor research
    Volume: 32
    Issue: 2
    Date: 1998
    Page Range: 104--110
    Publication Info: Hastings, Minn, Raptor Research Foundation, ©1987-
  2. By: Chávez León, Gilberto - Zaragoza Rivera, Sergio
    Type: Article
    In: Revista mexicana de biodiversidad
    Date: 2009-04-01