NPSpecies

an irregular and nomadic permanent resident of mixed conifer forest and ponderosa pine forests throughout the region. It is generally common in mixed conifer and fairly common in ponderosa pine, but its occurrence is unpredictable and likely driven by food availability (Brown et al. 1987). It is an irregular visitor to pinyon-juniper woodlands, where it may appear in any month of the year. There is only one record from the Colorado River: one was at RM 51.5 on 13 Jan 1998 (Charles T. LaRue, John R. Spence). Data source: Gatlin, BP. 2011. Annotated Checklist of the Birds of the Grand Canyon Region. 3rd edition.

For (Loxia curvirostra) * Red Crossbill is an irregular and nomadic permanent resident of mixed conifer forest and ponderosa pine forests throughout the region. It is generally common in mixed conifer and fairly common in ponderosa pine, but its occurrence is unpredictable and likely driven by food availability (Brown et al. 1987). It is an irregular visitor to pinyon-juniper woodlands, where it may appear in any month of the year. There is only one record from the Colorado River: one was at RM 51.5 on 13 Jan 1998 (Charles T. LaRue, John R. Spence). Conditions may vary among subspecies. Data source: Gatlin, BP. 2011. Annotated Checklist of the Birds of the Grand Canyon Region. 3rd edition.