ACCENTOR (-S)
ALCID (-S) 
AMADAVAT (-S) 
ANHINGA (-S) 
ANI (-S) 
AUK (-S) 
AVADAVAT (-S) 
AVIAN (-S) 
AVOCET (-S) 
BARBET (-S) 
BELLBIRD (-S) 
BITTERN (-S) 
BLACKCAP (-S)
BLUEBIRD (-S) 
BLUEJAY (-S) 
BOATBILL (-S)
BOBOLINK (-S)
BOBWHITE (-S)
BRANTAIL (-S)
BULBUL (-S)
BULLBAT (-S)
BUSTARD (-S)
BUZZARD (-S)
CAGELING (-S)
CAHOW (-S)
CANARY (-S)
CATBIRD (-S)
CHEBEC (-S)
CHICK (-S)
CHOUGH (-S)
CHUKAR (-S)
COLY (-IES)
COOT (-S)
CORVINE
COURLAN (-S)
COVEY (-S)
COWBIRD (-S)
CRAKE (-S)
CURASSOW (-S)
CURLEW (-S)
DAKERHEN (-S)
DODO (-OES,-S)
DORHAWK (-S)
DOTTEREL (-S)
DOVE (-S)
DOVEKIE (-S)
DRONGO (-S)
DUNLIN (-S)
EAGLE (-S)
EGRET (-S)
EMU (-S)
FALCON (-S)
FATBIRD (-S)
FINCH (-S)
FINFOOT (-S)
FIREBIRD (-S)
FLAMINGO (-OES,-S)
FOWLING (-S) 
FULMAR (-S)
GANNET (-S)
GEESE 
GLEDE (-S)
GODWIT (-S)
GOOSE
GRACKLE (-S)
GRAYBACK (-S)
GREBE (-S)
GUACHARO (-OES,-S)
GUAN (-S)
GUITGUIT (-S)
HAGDON (-S)
HALCYON (-S)
HANGBIRD (-S)
HANGNEST (-S)
HERON (-S)
HOATZIN (-ES,-S)
HOOPOE (-S)
HORNBILL (-S)
IBIS (-S) 
JABIRU (-S)
JACAMAR (-S)
JACANA (-S)
JACKDAW (-S)
JAY (-S)
JAYBIRD (-S)
KAE (-S)
KAGU (-S)
KILLDEER (-S)
KINGBIRD (-S)
KIWI (-S)
KOEL (-S)
LAPWING (-S)
LAVEROCK (-S)
LIMPKIN (-S)
LINNET (-S)
LOVEBIRD (-S)
LYREBIRD (-S)
MAGPIE (-S)
MANAKIN (-S)
MARTIN (-S)
MATIN (-S)
MAVIS (-ES)
MEGAPODE (-S)
MERLE (-S)
MOA (-S)
MOORFOWL (-S)
MOORHEN (-S)
MOPOKE (-S)
MOTMOT (-S)
MURRE (-S)
MURRELET (-S)
MYNA (-S)
NESTLING (-S)
NIGHTJAR (-S)
NOTORNIS
NUTHATCH (-ES)
OILBIRD (-S)
ORIOLE (-S)
ORTOLAN (-S)
OSCINE (-S)
OSCININE 
OSTRICH (-ES)
OUZEL (-S)
OVENBIRD (-S)
OWL (-S)
OXPECKER (-S)
PEETWEET (-S)
PELICAN (-S)
PENGUIN (-S)
PETREL (-S)
PEWEE (-S)
PHEASANT (-S)
PHILOMEL (-S)
PHOEBE (-S)
PHOENIX (-ES)
PIGEON (-S)
PIPIT (-S)
PLOVER (-S)
PLUMIPED (-S)
PUFFIN (-S)
QUETZAL (-S)
RAPTOR (-S)
RATITE (-S)
REDBIRD (-S)
REDLEG (-S)
REDSHANK (-S)
REDSTART (-S)
REEDBIRD (-S)
REEDLING (-S)
RHEA (-S)
RICEBIRD (-S)
ROBIN (-S)
ROC (-S)
ROTCHE (-S)
RUDDOCK (-S)
SANDPEEP (-S)
SAWBILL (-S)
SEABIRD (-S)
SEAFOWL (-S)
SERIEMA (-S)
SHOEBILL (-S)
SHRIKE (-S)
SKUA (-S)
SNOWBIRD (-S)
SONGBIRD (-S)
SORA (-S)
SPARROW (-S)
STARLING (-S)
STORK (-S)
SUNBIRD (-S)
SURFBIRD (-S)
SWIFT (-S)
TAKAHE (-S)
TANAGER (-S)
TERN (-S)
THROSTLE (-S)
THRUSH (-ES)
TINAMOU (-S)
TIT (-S)
TITLARK (-S)
TITMICE
TITMOUSE
TODY (-IES)
TOMTIT (-S)
TOUCAN (-S)
TOURACO (-S)
TROCHIL (-S)
TROGON (-S)
TROUPIAL (-S)
TUBENOSE (-S)
TUI (-S)
TURKEY (-S)
UMBRETTE (-S)
VEERY (-IES)
VERDIN (-S)
VIREO (-S)
VOLERY (-IES)
VULTURE (-S)
WAGTAIL (-S)
WAXBILL (-S)
WAXWING (-S)
WEKA (-S)
WHAUP (-S)
WHEATEAR (-S)
WHIMBREL (-S)
WHINCHAT (-S)
WHYDAH (-S)
WILDFOWL (-S)
WILLET (-S)
WOODCOCK (-S)
WOODLARK (-S)
WREN (-S)
WRYNECK (-S)