Gruiformes
  |
  \--+--+--Psophiidae (Trumpeters)
     |  \--+--Aramidae (Limpkin)
     |     \--Gruidae (Cranes)
     |
     \--+--+--Heliornithidae (Finfoots)
        |  \--Sarothruridae (Flufftails)
        \--Rallidae (Rails, Gallinules, Coots)