Cathartornis
Cathartornis is an ancient bird of the Teratornithidae family. The genus contains a single species, Cathartornis gracilis, known from only 2 tarsometatarsi, 1 complete and 1 containing only the distal end, recovered from the Late Pleistocene La [Brea Tar Pits] in Southern California. Since then, no other fossils have officially been referred to the taxon, though some fossils assigned to Teratornis could be from Cathartornis and unpublished remains have been mentioned.