COLUMBEA
  |--+--+--Phoenicopteriformes
  |  |    \--Phoenicopteridae (Flamingos)
  |  \--Podicipediformes
  |       \--Podicipedidae (Grebes)
  |
  \--+--+--Mesitornithiformes
     |  |   \--Mesitornithidae (Mesites)
     |  \--Pterocliformes
     |       \--Pteroclidae (Sandgrouse)
     \--Columbiformes
          \--Columbidae (Doves, Pigeons)