AVES
  |
NEORNITHES
  |
  +--PALEOGNATHS
  |    |--Struthioniformes
  |    |    \--+--Dinornithidae (Moas) [extinct]
  |    |       \--+--Rheidae (Rheas)
  |    |          \--+--Struthionidae (Ostriches)
  |    |             |--+--Casuariidae (Cassowaries)
  |    |             |  \--Dromaiidae (Emus)
  |    |             |--Aepyornithidae (Elephant Birds) [extinct]
  |    |             \--Apterygidae (Kiwis)
  |    \--Tinamiformes
  |         \--Tinamidae (Tinamous)
  |
  \--NEOGNATHS
       |--GALLOANSERAE
       |
       \--NEOAVES
            |--METAVES
            \--CORONAVES