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).