Habitat characteristics of Spotted Owl roosting sites (Strix occidentalis lucida) in the Sierra Madre Occidental, Mexico oleh Mariana Jovita Silva-Piña, Luis Antonio Tarango-Arámbula, Fernando Clemente-Sánchez, César Cortez-Romero, Alejandro Velázquez-Martínez, Javier Rafael-Valdez, Saúl Ugalde-Lezama