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The recovery plan for the Mexican spotted owl (Strix occidentalis lucida) recommended protection of owl nesting and roosting habitat. Descriptions of rnicrohabitat (less than or equal to-0.04 ha) characteristics associated with suitable nesting sites have been limited for the area of pine-oak forest occupied by this species in Arizona, USA. Therefore, we studied Mexican spotted owl habitat on a 585-km(2) study area on the Coconino Plateau near Flagstaff, Arizona. Mexican spotted owls nested primarily in mature (greater than or equal to45.7-cm diameter at breast height dbh) Gambel oak (Quercus gambelii; 40%) and ponderosa pine (Pines ponderosa; 37%) trees. We examined a plausible set of a priori models using both...