Temporal range: Eocene to present
The order Cathartiformes of raptors or birds of prey includes the New World vultures and the now extinct Teratornithidae. These raptors are classified by most taxonomic authorities in the order Accipitriformes (which includes the eagles and hawks). In the past they were considered to be a sister group to the storks of the order Ciconiiformes based on DNA-DNA hybridization and morphology.
- Chatterjee, Sankar; Templin, R. Jack Jr.; Campbell, Kenneth E. (July 24, 2007). "The aerodynamics of Argentavis, the world's largest flying bird from the Miocene of Argentina". Proceedings of the National Academy of Sciences. 104 (30): 12398–12403. doi:10.1073/pnas.0702040104. PMC 1906724. PMID 17609382.[not in citation given]
- Ligon, J. David. "Relationships of the cathartid vultures." (1967).
- Sibley, Charles Gald & Ahlquist, Jon Edward (1990): Phylogeny and classification of birds. Yale University Press, New Haven, Conn.
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