| All names | Abellerol gola-roig | Merops persicus |
| All names | Abellerol gola-roig | Merops superciliosus |
| All names | Abozeta | Recurvirostra avosetta |
| All names | Ahate buruzuria | Oxyura leucocephala |
| All names | Ahate buztanluzea | Anas acuta |
| All names | Ahate gorrizta | Netta rufina |
| All names | Ahate herdoiltsua | Oxyura jamaicensis |
| All names | Ahate iluna | Anas rubripes |
| All names | Ahate mokozabala | Anas clypeata |
| All names | Ahate txistulari amerikarra | Anas americana |
| All names | Ahate txistularia | Anas penelope |
| All names | Ahatebeltz arrunta | Melanitta nigra |
| All names | Ahatebeltz hegazuria | Melanitta fusca |
| All names | Ahatebeltz kopetazuria | Melanitta perspicillata |
| All names | Albatros cellanegre | Thalassarche melanophris |
| All names | Aliota arktikoa | Gavia arctica |
| All names | Aliota handia | Gavia immer |
| All names | Aliota mokozuri | Gavia adamsii |
| All names | Aliota txikia | Gavia stellata |
| All names | Alosa banyuda | Eremophila alpestris |
| All names | Amiamoko beltza | Ciconia nigra |
| All names | Amiamoko zuria | Ciconia ciconia |
| All names | Amilotx mottoduna | Lophophanes cristatus |
| All names | Amilotx urdina | Cyanistes caeruleus |
| All names | Amiltxori arrunta | Nycticorax nycticorax |
| All names | Amiltxori txikia | Ixobrychus minutus |
| All names | Antxeta burubeltza | Larus melanocephalus |
| All names | Antxeta hankabeltza | Rissa tridactyla |
| All names | Antxeta mokogorria | Larus ridibundus |
| All names | Antxeta txikia | Larus minutus |
| All names | Antzandobi arrunta | Lanius collurio |
| All names | Antzandobi handia | Lanius meridionalis |
| All names | Antzandobi handia aparratar | Lanius excubitor |
| All names | Antzandobi kaskagorria | Lanius senator |
| All names | Antzandobi mozorrotu | Lanius nubicus |
| All names | Antzandobi txiki | Lanius minor |
| All names | Antzara hankagorrizta | Anser anser |
| All names | Antzara hankahoria | Anser fabalis |
| All names | Antzara mokolaburra | Anser brachyrhynchus |
| All names | Antzara muturzuria | Anser albifrons |
| All names | Antzara nanoa | Anser erythropus |
| All names | Apo-hontza | Otus scops |
| All names | Aprika-eper | Alectoris barbara |
| All names | Araba zozo beltza | Sturnus unicolor |
| All names | Araba zozo pikarta | Sturnus vulgaris |
| All names | Argi-oilarra | Upupa epops |
| All names | Arrano arrantzalea | Pandion haliaetus |
| All names | Arrano beltza | Aquila chrysaetos |
| All names | Arrano pikarta | Aquila clanga |
| All names | Arrano pomeaniarra | Aquila pomarina |
| All names | Arrano sugezalea | Circaetus gallicus |
| All names | Arrano txikia | Aquila pennata |
| All names | Atalarra | Burhinus oedicnemus |
| All names | Audouin kaio | Larus audouinii |
| All names | Aztore arrunta | Accipiter gentilis |
| All names | Aztore-arranoa | Aquila fasciata |
| All names | Baldriga petita | Puffinus assimilis |
| All names | Basahatea | Anas platyrhynchos |
| All names | Baso-txinboa | Sylvia borin |
| All names | Basoetako gerri-txoria | Certhia familiaris |
| All names | Basoilarra | Tetrao urogallus |
| All names | Basoilo handia | Otis tarda |
| All names | Basoilo txikia | Tetrax tetrax |
| All names | Bec de serra coronat | Lophodytes cucullatus |
| All names | Belabeltza | Corvus corone |
| All names | Belatxinga mokogorria | Pyrrhocorax pyrrhocorax |
| All names | Belatxinga mokohoria | Pyrrhocorax graculus |
| All names | Belatz gorria | Falco tinnunculus |
| All names | Belatz handia | Falco peregrinus |
| All names | Belatz hankagorria | Falco amurensis |
| All names | Belatz hankagorria | Falco vespertinus |
| All names | Belatz txikia | Falco columbarius |
| All names | Bele txikia | Corvus monedula |
| All names | Beltxarga arrunta | Cygnus olor |
| All names | Beltxarga oihularia | Cygnus cygnus |
| All names | Beltxarga txistularia | Cygnus columbianus |
| All names | Beltzarana | Plegadis falcinellus |
| All names | Benarriz arrunta | Acrocephalus schoenobaenus |
| All names | Benarriz gorrizta | Locustella luscinioides |
| All names | Benarriz kaskabeltza | Acrocephalus melanopogon |
| All names | Benarriz nabarra | Locustella naevia |
| All names | Berdantza horia | Emberiza citrinella |
| All names | Bernagorri arrunta | Tringa totanus |
| All names | Bernagorri iluna | Tringa erythropus |
| All names | Bernat americà | Ardea herodias |
| All names | Birigarro arrunta | Turdus philomelos |
| All names | Birigarro txikia | Turdus iliacus |
| All names | Borrokalaria | Philomachus pugnax |
| All names | Boscarla dels arrossars | Acrocephalus agricola |
| All names | Boscarla dels matolls | Acrocephalus baeticatus |
| All names | Boscarla dels matolls | Acrocephalus dumetorum |
| All names | Branta kanadarra | Branta canadensis |
| All names | Branta lepagorri | Branta ruficollis |
| All names | Branta musubeltza | Branta bernicla |
| All names | Branta musuzuria | Branta leucopsis |
| All names | Buztangorri argia | Phoenicurus phoenicurus |
| All names | Buztangorri iluna | Phoenicurus ochruros |
| All names | Buztanikara horia | Motacilla cinerea |
| All names | Buztanikara zitrino | Motacilla citreola |
| All names | Buztanikara zuria | Motacilla alba |
| All names | Buztanluzea | Aegithalos caudatus |
| All names | Buztanoria | Bombycilla garrulus |
| All names | Buztanzuri arrunta | Oenanthe oenanthe |
| All names | Buztanzuri beltza | Oenanthe leucura |
| All names | Buztanzuri horia | Oenanthe hispanica |
| All names | Cabusset becgròs | Podilymbus podiceps |
| All names | Capsigrany pàl·lid | Lanius isabellinus |
| All names | Còlit del desert | Oenanthe deserti |
| All names | Corb marí pigmeu | Phalacrocorax pygmaeus |
| All names | Corredor | Cursorius cursor |
| All names | Corriol cua-roig | Charadrius vociferus |
| All names | Corriol de Leschenault | Charadrius leschenaultii |
| All names | Corriol mongol | Charadrius mongolus |
| All names | Corriol pecuari | Charadrius pecuarius |
| All names | Cotorra de Kramer | Psittacula krameri |
| All names | Cotorreta de pit gris | Myiopsitta monachus |
| All names | Cotxa cuablava | Tarsiger cyanurus |
| All names | Cotxa diademada | Phoenicurus moussieri |
| All names | Cuaenlairat | Cercotrichas galactotes |
| All names | Cucut becgroc | Coccyzus americanus |
| All names | Daurada petita americana | Pluvialis dominica |
| All names | Daurada petita del Pacífic | Pluvialis fulva |
| All names | Delaware kaioa | Larus delawarensis |
| All names | Dilindaria | Remiz pendulinus |
| All names | Durdula | Turdus pilaris |
| All names | Eguzki-arrano iberiarra | Aquila adalberti |
| All names | Eguzki-arranoa | Aquila heliaca |
| All names | Eider arrunta | Somateria mollissima |
| All names | Eider erregea | Somateria spectabilis |
| All names | Ekaitz-txori handia | Oceanodroma leucorhoa |
| All names | Ekaitz-txori txikia | Hydrobates pelagicus |
| All names | Elano urdina | Elanus caeruleus |
| All names | Eleonor belatza | Falco eleonorae |
| All names | Elur-antzara | Chen caerulescens |
| All names | Elur-antzara | Anser caerulescens |
| All names | Elur-berdantza | Plectrophenax nivalis |
| All names | Elur-hontz | Bubo scandiacus |
| All names | Elur-txonta | Montifringilla nivalis |
| All names | Enara arrunta | Hirundo rustica |
| All names | Enara azpizuria | Delichon urbicum |
| All names | Enara ipurgorria | Cecropis daurica |
| All names | Enganyapastors americà | Chordeiles minor |
| All names | Eper gorria | Alectoris rufa |
| All names | Eper grisa | Perdix perdix |
| All names | Erlatxoria | Merops apiaster |
| All names | Erregetxo bekainzuria | Regulus ignicapilla |
| All names | Errekattxindorra | Cettia cetti |
| All names | Erroia | Corvus corax |
| All names | Escuraflascons de Wilson | Phalaropus tricolor |
| All names | Eskinosoa | Garrulus glandarius |
| All names | Estornell rosat | Pastor roseus |
| All names | Etxe belatza | Falco naumanni |
| All names | Etxe-txolarrea | Passer domesticus |
| All names | Etze-txinboa | Sylvia undata |
| All names | Euli-txori beltz | Ficedula hypoleuca |
| All names | Euli-txori grisa | Muscicapa striata |
| All names | Euli-txori papargorri | Ficedula parva |
| All names | Ezkai-txinboa | Sylvia conspicillata |
| All names | Faisai arrunta | Phasianus colchicus |
| All names | Falciot culblanc comú | Apus affinis |
| All names | Falciot pàl·lid | Apus pallidus |
| All names | Flamenko handia | Phoenicopterus roseus |
| All names | Fotja banyuda | Fulica cristata |
| All names | Fredeluga cuablanca | Vanellus leucurus |
| All names | Fredeluga gregària | Vanellus gregarius |
| All names | Fregata grossa | Fregata magnificens |
| All names | Fulmarra | Fulmarus glacialis |
| All names | Gabai | Puffinus mauretanicus |
| All names | Gabai arrea | Calonectris diomedea |
| All names | Gabai arrunta | Puffinus puffinus |
| All names | Gabai handia | Puffinus gravis |
| All names | Gabai iluna | Puffinus griseus |
| All names | Gabai mediterranearra | Puffinus yelkouan |
| All names | Gabirai arrunta | Accipiter nisus |
| All names | Gailupa | Pyrrhula pyrrhula |
| All names | Galeperra | Coturnix coturnix |
| All names | Gamba groga grossa | Tringa melanoleuca |
| All names | Gamba groga petita | Tringa flavipes |
| All names | Ganga azpizuria | Pterocles alchata |
| All names | Ganga estepària | Syrrhaptes paradoxus |
| All names | Gari-berdantza | Emberiza calandra |
| All names | Garrapoa | Sitta europaea |
| All names | Garraztarroa | Turdus viscivorus |
| All names | Gavina capnegra americana | Larus atricilla |
| All names | Gavina de Bonaparte | Larus philadelphia |
| All names | Gavina rosada | Rhodostethia rosea |
| All names | Gavinot polar | Larus glaucoides |
| All names | Gerri-txori arrunta | Certhia brachydactyla |
| All names | Giloia | Crex crex |
| All names | Grasset de costa | Anthus petrosus |
| All names | Haitz-enara | Ptyonoprogne rupestris |
| All names | Haitz-usoa | Columba livia |
| All names | Harkaitz-txolarrea | Petronia petronia |
| All names | Harkaitz-txoria | Tichodroma muraria |
| All names | Harkaltz-zozo gorria | Monticola saxatilis |
| All names | Harkaltz-zozo urdina | Monticola solitarius |
| All names | Harri-iraularia | Arenaria interpres |
| All names | Hegabera | Vanellus vanellus |
| All names | Hegatxabal arrunta | Alauda arvensis |
| All names | Hego-belatza | Falco biarmicus |
| All names | Hesi-berdantza | Emberiza cirlus |
| All names | Hontza ertaina | Asio otus |
| All names | Hontza handia | Bubo bubo |
| All names | Hontza zuria | Tyto alba |
| All names | Hubara | Chlamydotis undulata |
| All names | Igitai-ahatea | Anas falcata |
| All names | Intxaur-jale | Nucifraga caryocatactes |
| All names | Ipar-ahatea | Anas strepera |
| All names | Ipar-belea | Corvus frugilegus |
| All names | Ipar-gailupa | Carpodacus erythrinus |
| All names | Ipar-txenada | Sterna paradisaea |
| All names | Istingor arrunta | Gallinago gallinago |
| All names | Istingor handia | Gallinago media |
| All names | Istingor txikia | Lymnocryptes minimus |
| All names | Itsas arrano buztanzuria | Haliaeetus albicilla |
| All names | Itsas enara beltza | Chlidonias niger |
| All names | Itsas enara hegalzuria | Chlidonias leucopterus |
| All names | Itsas enara musuzuria | Chlidonias hybrida |
| All names | Itsas mika | Haematopus ostralegus |
| All names | Izotz-ahatea | Clangula hyemalis |
| All names | Kaio beltza | Larus marinus |
| All names | Kaio hankahori | Larus cachinnans |
| All names | Kaio hankahori | Larus michahellis |
| All names | Kaio hankahoria | Larus cachinnans |
| All names | Kaio hankahoria | Larus michahellis |
| All names | Kaio hauskara | Larus argentatus |
| All names | Kaio hegalzuri | Larus hyperboreus |
| All names | Kaio iluna | Larus fuscus |
| All names | Kaio mokohoria | Larus canus |
| All names | Kaio mokozorrotz | Larus genei |
| All names | Kalandria | Melanocorypha calandra |
| All names | Karnaba | Carduelis carduelis |
| All names | Karraka | Coracias garrulus |
| All names | Kaskabeltz handia | Parus major |
| All names | Kaskabeltz txikia | Poecile palustris |
| All names | Kopetazuri arrunta | Fulica atra |
| All names | Kuku mottuduna | Clamator glandarius |
| All names | Kukua | Cuculus canorus |
| All names | Kuliska buztanbeltza | Limosa limosa |
| All names | Kuliska gorria | Limosa lapponica |
| All names | Kuliska iluna | Tringa ochropus |
| All names | Kuliska pikarta | Tringa glareola |
| All names | Kuliska txikia | Actitis hypoleucos |
| All names | Kuliska zuria | Tringa nebularia |
| All names | Kurlinta bekainduna | Numenius phaeopus |
| All names | Kurlinta handia | Numenius arquata |
| All names | Kurlinta mokomehea | Numenius tenuirostris |
| All names | Kurrilo arrunta | Grus grus |
| All names | Kutturlio arrunta | Galerida cristata |
| All names | Kutturlio mokolaburra | Galerida theklae |
| All names | Lagopodo zuria | Lagopus muta |
| All names | Landa-lezkari | Acrocephalus palustris |
| All names | Landa-txirta | Anthus campestris |
| All names | Landa-txolarrea | Passer montanus |
| All names | Lanperna-musu | Fratercula arctica |
| All names | Lare-buztanikara | Motacilla flava |
| All names | Larreoiloa | Bonasa bonasia |
| All names | Lepitzulia | Jynx torquilla |
| All names | Lertxun gorria | Ardea purpurea |
| All names | Lertxun hauskara | Ardea cinerea |
| All names | Lertxuntxo handia | Ardea alba |
| All names | Lertxuntxo itzaina | Bubulcus ibis |
| All names | Lertxuntxo karramarrozalea | Ardeola ralloides |
| All names | Lertxuntxo txikia | Egretta garzetta |
| All names | Lezkari arrunta | Acrocephalus scirpaceus |
| All names | Lezkari karratxina | Acrocephalus arundinaceus |
| All names | Lira-oilarra | Tetrao tetrix |
| All names | Malkar-sorbeltza | Tachymarptis melba |
| All names | Marikoi isatsbihurra | Stercorarius pomarinus |
| All names | Marikoi isatslaburra | Stercorarius parasiticus |
| All names | Marikoi isatsluze | Stercorarius longicaudus |
| All names | Martin arrantzalea | Alcedo atthis |
| All names | Martin arrunta | Uria aalge |
| All names | Martin hegalzuri | Cepphus grylle |
| All names | Martinet dels esculls | Egretta gularis |
| All names | Mascarell emmascarat | Sula dactylatra |
| All names | Mendebal-txori mokolodia | Phalaropus fulicarius |
| All names | Mendebal-txori mokomehea | Phalaropus lobatus |
| All names | Mendi-berdantza | Emberiza cia |
| All names | Mendi-erregetxoa | Regulus regulus |
| All names | Mendi-tuntuna | Prunella collaris |
| All names | Mendi-txirriskila | Serinus citrinella |
| All names | Mendi-txirti | Anthus spinoletta |
| All names | Miarritza | Emberiza hortulana |
| All names | Mika | Pica pica |
| All names | Mirotz lepazuria | Circus macrourus |
| All names | Mirotz urdina | Circus pygargus |
| All names | Mirotz zuria | Circus cyaneus |
| All names | Miru beltza | Milvus migrans |
| All names | Miru gorria | Milvus milvus |
| All names | Mokoker hegalzuri | Loxia leucoptera |
| All names | Mokokerra | Loxia curvirostra |
| All names | Mokolodia | Coccothraustes coccothraustes |
| All names | Mokozabala | Platalea leucorodia |
| All names | Mosquiter de Schwarz | Phylloscopus schwarzi |
| All names | Mosquiter fosc | Phylloscopus fuscatus |
| All names | Mosquiter ibèric | Phylloscopus ibericus |
| All names | Mosquiter pàl·lid | Phylloscopus bonelli |
| All names | Mosquiter reietó | Phylloscopus proregulus |
| All names | Mosquiter verdós | Phylloscopus trochiloides |
| All names | Mozoloa | Athene noctua |
| All names | Murgil handia | Podiceps cristatus |
| All names | Murgil lepagorria | Podiceps grisegena |
| All names | Murgilari arrea | Aythya nyroca |
| All names | Murgilari arrunta | Aythya ferina |
| All names | Murgilari handia | Aythya marila |
| All names | Murgilari islandiarra | Bucephala islandica |
| All names | Murgilari lepokoduna | Aythya collaris |
| All names | Murgilari mottoduna | Aythya fuligula |
| All names | Murgilari txikia | Aythya affinis |
| All names | Murgilari urrebegia | Bucephala clangula |
| All names | Negu-txirta | Anthus pratensis |
| All names | Negu-txonta | Fringilla montifringilla |
| All names | Oilagorra | Scolopax rusticola |
| All names | Okil beltza | Dryocopus martius |
| All names | Okil berdea | Picus viridis |
| All names | Okil ertaina | Dendrocopos medius |
| All names | Okil gibelnabarra | Dendrocopos leucotos |
| All names | Okil handia | Dendrocopos major |
| All names | Okil txikia | Dendrocopos minor |
| All names | Pagausoa | Columba palumbus |
| All names | Paita arrunta | Tadorna tadorna |
| All names | Paita gorrizta | Tadorna ferruginea |
| All names | Papamosques de collar | Ficedula albicollis |
| All names | Paparrurdina | Luscinia svecica |
| All names | Paràsit gros | Stercorarius skua |
| All names | Perdiu de mar d'ala negra | Glareola nordmanni |
| All names | Petrell de Bulwer | Bulweria bulwerii |
| All names | Petrell de Madeira | Oceanodroma castro |
| All names | Petrell de Swinhoe | Oceanodroma monorhis |
| All names | Petrell oceànic | Oceanites oceanicus |
| All names | Pinsà trompeter | Bucanetes githagineus |
| All names | Pinu-kaskabeltza | Periparus ater |
| All names | Pipizkan kaioa | Larus pipixcan |
| All names | Pirripioa | Lullula arborea |
| All names | Pitxartxar burubeltz | Saxicola rubicola |
| All names | Pitxartxar nabarra | Saxicola rubetra |
| All names | Piula de Hodgson | Anthus hodgsoni |
| All names | Polla blava d'Allen | Porphyrio alleni |
| All names | Polla pintada de Carolina | Porzana carolina |
| All names | Portugal-ko pirripioa | Chersophilus duponti |
| All names | Pottorro arrunta | Alca torda |
| All names | Pottorro txikia | Alle alle |
| All names | Pratinkola | Glareola pratincola |
| All names | Repicatalons de Lapònia | Calcarius lapponicus |
| All names | Repicatalons rústic | Emberiza rustica |
| All names | Richard txirta | Anthus richardi |
| All names | Sabine antxeta | Xema sabini |
| All names | Sai arrea | Gyps fulvus |
| All names | Sai motza | Aegypius monachus |
| All names | Sai zuria | Neophron percnopterus |
| All names | Sasi-txinboa | Sylvia communis |
| All names | Sasi-txori arrunta | Hippolais polyglotta |
| All names | Sasi-txori horizta | Hippolais icterina |
| All names | Sasi-txori zurizta | Hippolais pallida |
| All names | Sasitxinbotxo | Sylvia curruca |
| All names | Sit capblanc | Emberiza leucocephalos |
| All names | Sit capnegre | Emberiza melanocephala |
| All names | Sit caranegre | Emberiza aureola |
| All names | Sorbeltz arrunta | Apus apus |
| All names | Tallarol emmascarat | Sylvia hortensis |
| All names | Tarina | Carduelis spinus |
| All names | Temminck txirria | Calidris temminckii |
| All names | Tengmalm hontza | Aegolius funereus |
| All names | Terek kuliska | Xenus cinereus |
| All names | Terrerola vulgar | Calandrella brachydactyla |
| All names | Territ acuminat | Calidris acuminata |
| All names | Territ becadell | Limicola falcinellus |
| All names | Territ camallarg | Calidris himantopus |
| All names | Territ cuablanc | Calidris fuscicollis |
| All names | Territ cuallarg | Bartramia longicauda |
| All names | Territ d'Alaska | Calidris mauri |
| All names | Territ de Baird | Calidris bairdii |
| All names | Territ menut canadenc | Calidris minutilla |
| All names | Territ pectoral | Calidris melanotos |
| All names | Territ rogenc | Tryngites subruficollis |
| All names | Territ semipalmat | Calidris pusilla |
| All names | Tetolet becllarg | Limnodromus scolopaceus |
| All names | Tord golanegre | Turdus ruficollis |
| All names | Tórtora rogenca | Streptopelia orientalis |
| All names | Trist | Cisticola juncidis |
| All names | Tuntun arrunta | Prunella modularis |
| All names | Txantxangorria | Erithacus rubecula |
| All names | Txenada arrunta | Sterna hirundo |
| All names | Txenada gorriska | Sterna dougallii |
| All names | Txenada hankabeltza | Thalasseus sandvicensis |
| All names | Txenada mokobeltza | Gelochelidon nilotica |
| All names | Txenada mokogorria | Hydroprogne caspia |
| All names | Txenada txikia | Sternula albifrons |
| All names | Txepetxa | Troglodytes troglodytes |
| All names | Txiki-berdantza | Emberiza pusilla |
| All names | Txilinporta lepabeltza | Podiceps nigricollis |
| All names | Txilinporta txikia | Tachybaptus ruficollis |
| All names | Txilinporta urrebelarria | Podiceps auritus |
| All names | Tximutxa | Panurus biarmicus |
| All names | Txinbo burubeltza | Sylvia melanocephala |
| All names | Txinbo gabirai | Sylvia nisoria |
| All names | Txinbo kaskabeltza | Sylvia atricapilla |
| All names | Txinbo papargorrizta | Sylvia cantillans |
| All names | Txinbo sardiniarra | Sylvia balearica |
| All names | Txinbo sardiniarra | Sylvia sarda |
| All names | Txio arrunta | Phylloscopus collybita |
| All names | Txio horia | Phylloscopus trochilus |
| All names | Txio marrabiko | Phylloscopus humei |
| All names | Txio marrabiko | Phylloscopus inornatus |
| All names | Txio txistularia | Phylloscopus sibilatrix |
| All names | Txirri arrunta | Calidris alpina |
| All names | Txirri grisa | Pluvialis squatarola |
| All names | Txirri iluna | Calidris maritima |
| All names | Txirri kurlinta | Calidris ferruginea |
| All names | Txirri lepokoduna | Charadrius morinellus |
| All names | Txirri lodia | Calidris canutus |
| All names | Txirri txikia | Calidris minuta |
| All names | Txirri zuria | Calidris alba |
| All names | Txirriskil arrunta | Serinus serinus |
| All names | Txirritxo handia | Charadrius hiaticula |
| All names | Txirritxo hankabeltza | Charadrius alexandrinus |
| All names | Txirritxo txikia | Charadrius dubius |
| All names | Txirta lepagorria | Anthus cervinus |
| All names | Txoka arrunta | Carduelis cannabina |
| All names | Txoka gorritza | Carduelis flammea |
| All names | Txoka mokoria | Carduelis flavirostris |
| All names | Txolarre ilun | Passer hispaniolensis |
| All names | Txoloma | Columba oenas |
| All names | Txonda arrunta | Fringilla coelebs |
| All names | Txori zezen arrunta | Botaurus stellaris |
| All names | Txoriandre pispoleta | Calandrella rufescens |
| All names | Txorru arrunta | Carduelis chloris |
| All names | Ubarroi handia | Phalacrocorax carbo |
| All names | Ubarroi mottoduna | Phalacrocorax aristotelis |
| All names | Uda-txirta | Anthus trivialis |
| All names | Udako zertzeta | Anas querquedula |
| All names | Ugatza | Gypaetus barbatus |
| All names | Uhalde-enara | Riparia riparia |
| All names | Ur-benarriza | Acrocephalus paludicola |
| All names | Ur-zozoa | Cinclus cinclus |
| All names | Urmael-bernagorria | Tringa stagnatilis |
| All names | Uroilanda handia | Rallus aquaticus |
| All names | Uroilanda hankaberdea | Porzana parva |
| All names | Uroilanda pikarta | Porzana porzana |
| All names | Uroilanda txikia | Porzana pusilla |
| All names | Uroilo urdina | Porphyrio porphyrio |
| All names | Uroiloa arrunta | Gallinula chloropus |
| All names | Urre-txirri arrunta | Pluvialis apricaria |
| All names | Urretxindor | Luscinia luscinia |
| All names | Urretxindorra | Luscinia megarhynchos |
| All names | Urretxoria | Oriolus oriolus |
| All names | Urubia | Strix aluco |
| All names | Usapal turkiarra | Streptopelia decaocto |
| All names | Usapala | Streptopelia turtur |
| All names | Viri d'ull vermell | Vireo olivaceus |
| All names | Voltor torgos | Torgos tracheliotus |
| All names | Xarxet de Carolina | Anas carolinensis |
| All names | Xarxet de Carolina | Anas crecca |
| All names | Xatrac bengalí | Thalasseus bengalensis |
| All names | Xatrac de Forster | Sterna forsteri |
| All names | Xatrac elegant | Thalasseus elegans |
| All names | Xatrac fosc | Onychoprion fuscatus |
| All names | Xivitona maculada | Actitis macularius |
| All names | Zanga | Morus bassanus |
| All names | Zankaluzea | Himantopus himantopus |
| All names | Zapelatz arrunta | Buteo buteo |
| All names | Zapelatz galtzaduna | Buteo lagopus |
| All names | Zapelatz handia | Buteo rufinus |
| All names | Zapelatz liztorjalea | Pernis apivorus |
| All names | Zata arrunta | Caprimulgus europaeus |
| All names | Zata lapagorria | Caprimulgus ruficollis |
| All names | Zerra ertaina | Mergus serrator |
| All names | Zerra handia | Mergus merganser |
| All names | Zerra txikia | Mergellus albellus |
| All names | Zertzeta arrunta | Anas carolinensis |
| All names | Zertzeta arrunta | Anas crecca |
| All names | Zertzeta hegalurdina | Anas discors |
| All names | Zertzeta marmolairea | Marmaronetta angustirostris |
| All names | Zingira-berdantza | Emberiza schoeniclus |
| All names | Zingira-hontza | Asio flammeus |
| All names | Zingira-mirotza | Circus aeruginosus |
| All names | Zozo arrunta | Turdus merula |
| All names | Zozo paparzuria | Turdus torquatus |
| All names | Zuhaitz-belatza | Falco subbuteo |
