We report the causes of morbidity of 2,458 free-living raptors admitted to the Tafira Wildlife Rehabilitation Center on Gran Canaria Island, Spain, during 2003-13. The seasonal cumulative incidences were investigated while considering estimates of the wild populations in the region. These methods were used as a more accurate approach to assess the potential ecologic impact of different causes of morbidity. The most frequently admitted species were the Eurasian Kestrel ( Falco tinnunculus ; 53.0%), the Eurasian Long-eared Owl ( Asio otus canariensis; 28.1%), the Canary Islands Common Buzzard ( Buteo buteo insularum; 8.0%), and the Eurasian Barn Owl ( Tyto alba ; 4.4%). The most frequent causes of admission were trauma (33.8%), orphaned-young birds (21.7%), unknown (18.4%), and metabolic/nutritional disease (11.1%). Local morbidity caused by glue trapping and entanglement in burr bristlegrass (Setaria adhaerens) had prevalences of 5.0% and 1.8%, respectively. The highest number of admissions during the breeding and nonbreeding seasons was observed for the Eurasian Barn Owl and the Barbary Falcon ( Falco pelegrinoides ), respectively, mainly due to trauma of unknown origin.
Keywords: Birds of prey; causes of morbidity; raptors; wildlife rehabilitation center.