ApsaravisIchthyornisHesperornisTinamidaeRheidaeApterygidaeGalliformesAnhimidaeAnatidaeOpisthocomidaeCariamidaeCuculidaeMusophagidaeOtididaeRallidaePsittaciformesColiidaeCoraciidaePasseriformesSpheniscidaeProcellariidaePodicipedidaeGaviidaeThreskiornithidaePhoenicopteridaeCiconiidaeSagittariidaeCathartidaeStrigiformesAccipitridaeFalconidaeRecurvirostridaeBurhinidaePhaethontidaeFregatidaePhalacrocoracidaeBalaenicipitidaeEurypygidaeArdeidaePteroclidaeColumbidaePsophiidaeGruidaeAegothelidaeSteatornithidaeTrogonidaeOsteologyMaximum ParsimonyBased on reanalysis of the original matrix.Mayr_et_Clarke_2003a