sentences: "A nearly identical definition, "the theropod group that includes all taxa closer to "Passer" than to "Dromaeosaurus"", was used by Agnolín and Novas (2013) for their clade Averaptora.Additionally, beginning in the late 2000s and early 2010s, several groups of researchers began adding the genus "Troodon" as an additional specifier in the definition of Avialae.