Accipitridae
In this family there is a unique combination of extremely long and entangled barbules and slightly thickened proximal nodes which abruptly decrease in size. When pigment is present, it is stippled. Species examined within this family: Pernis apivorus, Milvus migrans, Neophron percnopterus, Gyps fulvus, Circaetus gallicus, Circus aeruginosus, Circus cyaneus, Circus macrourus, Accipiter gentilis, Accipiter nisus, Accipiter brevipes, Buteo buteo, Buteo rufinus, Aquila pomarina, Aquila clanga, Aquila nipalensis, Hieraaetus pennatus, Hieraaetus fasciatus.