Troodontidae
|-Sinovenator changii
   |
   |-?Koparion douglassi
      |
      |-Sinornithoides youngi
      |-?Araucanoraptor argentinus
         |
         |-Byronosaurus jaffei
         |-?Archaeornithoides deinosaricus
         |-?Borogovia gracilicrus
         |-?Tochisaurus nemegtensis
            |
            |-Saurornithoides mongoliensis
            |-Saurornithoides junior
            |-Saurornithoides asiamericanus
            |-Saurornithoides isfarensis
            |-Troodon formosus

The extremely large orbital openings, the stereotopic vision, and the large brain may indicate some
sort of nocturnal, organized pack-hunting - something that can easily be a synonym of Late-Cretaceous
night-terror, but this is, for now, only spekulation.

Troodontids were probably omnivorous.