Accipitrimorphae

Accipitrimorphae is a group of birds that includes the New World vultures, Secretarybird, Osprey and the hawk family, Accipitridae.

Taxonomy
Members of Accipitrimorphae were once a part of Falconiformes (Sibley and Ahlquist, 1991).

Cathartidae
The New World vultures were once part of the storks (Sibley and Ahlquist, 1990? ), while Sibley and Monroe placed them as a subfamily of Ciconiidae, as a part of the "expanded Ciconiiformes".

This was shown to be untrue, and more recent research (e.g., Hackett et al., 2008 ; Han et al., 2011 ; McCormack et al., 2013 ; Yuri et al., 2013 ) puts the New World vultures close to the Accipitriformes.

Sagittariidae
The Secretarybird is occasionally included in Accipitridae (EDGE).

Pycraft (1902) and Mayr and Amadon (1951) considered it to be closer to the Gruiformes than the Falconiformes.