Numerous studies have reported some haematological characteristics of diurnal raptors; however, few of these have characterised the haematological response to disease. We investigated the haematological characteristics, exhibited in response to a range of injuries and naturally occurring inflammatory disease, of seven birds from six species of Falconiformes. A spectrum of leukocyte responses was observed. Some form of morphological atypia was evident in the heterophils of all birds and was the most reliable indicator of inflammation. The concentration of leukocytes varied between each case, with the least concentration of heterophils observed to be 0.18Ã—109/l and the greatest concentration of heterophils observed to be 6.00Ã—109/l. This study illustrates the heterogeneous haematological response exhibited by Falconiformes to different inflammatory challenges.