The family Cathartidae has sometimes been placed within the order Ciconiiformes, due to observations that these birds are related to storks, and indicated by the Sibley-Ahlquist (1990, 1993) classification based on DNA hybridization<ref>https://digilander.libero.it/avifauna/classificazione/sequence5.htm</ref>. This approach has never been unanimous among ornithologists, and further genetic studies would support that opinion<ref>http://www.museum.lsu.edu/~Remsen/SACCprop241.htm</ref>. Rather than a family within either Accipitriformes or Ciconiiformes, a separate order, Cathartiformes, is sometimes used. | The family Cathartidae has sometimes been placed within the order Ciconiiformes, due to observations that these birds are related to storks, and indicated by the Sibley-Ahlquist (1990, 1993) classification based on DNA hybridization<ref>https://digilander.libero.it/avifauna/classificazione/sequence5.htm</ref>. This approach has never been unanimous among ornithologists, and further genetic studies would support that opinion<ref>http://www.museum.lsu.edu/~Remsen/SACCprop241.htm</ref>. Rather than a family within either Accipitriformes or Ciconiiformes, a separate order, Cathartiformes, is sometimes used. |