Paravians comprises two major sub-groups : Avialae , including Jeholornis and flying birds , and the Deinonychosauria , which includes the dromaeosaurids and troodontids , which may or may not form a natural group .
The paravians include the Avialae , such as Archaeopteryx , and the Deinonychosauria , which includes the dromaeosaurids and troodontids .