AVES
  |
NEORNITHES
  |
  +-PALEOGNATHS
  |   \-+--Struthioniformes
  |     |     \--Struthionidae (Ostriches)
  |     |
  |     \-+--+--Rheiformes
  |       |  |    \--Rheidae (Rheas)
  |       |  |
  |       |  \-+--Casuariiformes
  |       |    |    \--+--Dromaiidae (Emus)
  |       |    |       \--Casuariidae (Cassowaries)
  |       |    |
  |       |    \--+--Apterygiformes
  |       |       |    \--Apterygidae (Kiwis)
  |       |       |
  |       |       \-?Aepyornithiformes
  |       |            \--†Aepyornithidae (Elephant Birds)
  |       |
  |       \-+--Dinornithiformes
  |         |    \--†Dinornithidae (Moas)
  |         |
  |         \--+--Lithornithiformes
  |            |    \--†Lithornithidae
  |            |
  |            \--Tinamiformes
  |                 \--Tinamidae (Tinamous)
  |
  \-NEOGNATHS
      |--GALLOANSERAE
      |
      \--NEOAVES
           |--METAVES
           \--CORONAVES