WAegialornis
WStrigogyps
WAdzebill
WArchaeotrogonidae
WBathornithidae
WDiomedeoides
WDromornithidae
WEocoracias
WEogruidae
WGastornis
WIdiornithidae
WLithornithidae
WMesselasturidae
WPalaelodidae
WPelagornithidae
WPhorusrhacidae
WPlotopteridae
WPresbyornithidae
WQianshanornis
WSophiornithidae
WSylviornithidae
WTeratornithidae
WZygodactylidae