Cliff outcrops used as condor communal roosts are local hotspots of occupancy and intense use by other bird species. Biological Conservation, 200: 8-16.
Informe de presencia estacional de aves del Monumento Natural Bosques Petrificados
Informe sobre el Monumento Natural Bosque Petrificado. 21 al 23 /2/1981. 5 pp.