“…Although several authors claim that birds of prey, especially gyrfalcon (Falco rusticollis) and its hybrids, golden eagle (Aquila chrysaetos), osprey (Pandion haliaetus), goshawk (Accipiter gentilis), roughlegged hawk (Buteo lagopus) and red-tailed hawk (Buteo jamaicensis), are highly susceptible to aspergillosis (Redig, 1993;Joseph, 2000;Tell, 2005;Silvanose, 2012, personal communication), the expected difference in species susceptibility between 8-month-old hybrid falcons and 8-month-old pigeons was not observed. On the other hand, age-related susceptibility to aspergillosis is reported for falcons (Joseph, 2000), pigeons (Beernaert et al, 2008), turkeys (Femenia et al, 2007) and white storks (Olias et al, 2010). Therefore, infection trials with young hybrid falcons and pigeons should be performed to determine the influence of age in the development of aspergillosis within the model used.…”