Canadese Gans (Dutch)
Casarca (Dutch)
Cetti's Zanger (Dutch)
Cirlgors (Dutch)
Citroenkanarie (Dutch)
Citroenkwikstaart (Dutch)
Corsicaanse Boomklever (Dutch)
Calandra Lark (English)
Canada Goose (English)
Capercaillie (English)
Carrion Crow (English)
Caspian Plover (English)
Caspian Tern (English)
Cattle Egret (English)
Cetti's Warbler (English)
Chaffinch (English)
Chiffchaff (English)
Chough (English)
Chukar Partridge (English)
Cirl Bunting (English)
Citril Finch (English)
Citrine Wagtail (English)
Coal Tit (English)
Collared Dove (English)
Collared Flycatcher (English)
Collared Pratincole (English)
Common Buzzard (English)
Common Coot (English)
Common Crane (English)
Common Crossbill (English)
Common Cuckoo (English)
Common Eider (English)
Common Goldeneye (English)
Common Greenshank (English)
Common Gull (English)
Common Kestrel (English)
Common Kingfisher (English)
Common Moorhen (English)
Common Nightingale (English)
Common Oystercatcher (English)
Common Pheasant (English)
Common Pochard (English)
Common Quail (English)
Common Redpoll (English)
Common Redshank (English)
Common Redstart (English)
Common Sandpiper (English)
Common Scoter (English)
Common Shelduck (English)
Common Skylark (English)
Common Snipe (English)
Common Stonechat (English)
Common Swift (English)
Common Teal (English)
Common Tern (English)
Common Waxbill (English)
Common Whitethroat (English)
Corn Bunting (English)
Corn Crake (English)
Corsican Nuthatch (English)
Cory's Shearwater (English)
Crag Martin (English)
Crested Lark (English)
Crested Tit (English)
Cretzschmar's Bunting (English)
Curlew Sandpiper (English)
Caille des blés (French)
Canard chipeau (French)
Canard colvert (French)
Canard pilet (French)
Canard siffleur (French)
Canard souchet (French)
Casse-noix moucheté (French)
Chardonneret (French)
Chevalier aboyeur (French)
Chevalier arlequin (French)
Chevalier combattant (French)
Chevalier cul-blanc (French)
Chevalier gambette (French)
Chevalier guignette (French)
Chevalier stagnatile (French)
Chevalier sylvain (French)
Chocard à bec jaune (French)
Choucas des tours (French)
Chouette chevêche (French)
Chouette chevêchette (French)
Chouette de l'Oural (French)
Chouette de Tengmalm (French)
Chouette effraie (French)
Chouette épervière (French)
Chouette hulotte (French)
Chouette lapone (French)
Chukarhuhn (French)
Cicogne blanche (French)
Cicogne noire (French)
Cincle plongeur (French)
Circaète Jean-le-Blanc (French)
Cistensänger (French)
Cochevis de Thékla (French)
Cochevis huppé (French)
Corbeau freux (French)
Cormoran huppé (French)
Cormoran pygmée (French)
Corneille mantelée (French)
Corneille noire (French)
Coucou gris (French)
Coucou-geai (French)
Courlis cendré (French)
Courlis corlieu (French)
Crave à bec rouge (French)
Cygne de Bewick (French)
Cygne sauvage (French)
Cygne tuberculé (muet) (French)
Chukarsteinhuhn (German)
Common Murre (German)
Common Rosefinch (German)
Crested Coot (German)
Calandra (Italian)
Calandra nera (Italian)
Calandra siberiana (Italian)
Calandrella (Italian)
Calandrina (o Pispoletta) (Italian)
Calandro (Italian)
Calandro maggiore (Italian)
Camachuelo carminoso (Italian)
Canapiglia (Italian)
Canapino (Italian)
Canapino asiatico (Italian)
Canapino levantino (Italian)
Canapino maggiore (Italian)
Canapino pallido (Italian)
Cannaiola (Italian)
Cannaiola di Blyth (Italian)
Cannaiola di Jerden (Italian)
Cannaiola verdognola (Italian)
Cannareccione (Italian)
Capinera (Italian)
Capovaccaio (Italian)
Cappellaccia (Italian)
Cappellaccia di tekla (Italian)
Cardellino (Italian)
Casarca (Italian)
Cavaliere d’Italia (Italian)
Cesena (Italian)
Chiurlo (Italian)
Chiurlo piccolo (Italian)
Chorlitejo patinegro (Italian)
Cicogna bianca (Italian)
Cicogna nera (Italian)
Cigno minore (Italian)
Cigno reale (Italian)
Cigno selvatico (Italian)
Cincia azzurra (Italian)
Cincia bigia (Italian)
Cincia bigia alpestre (Italian)
Cincia dal ciuffo (Italian)
Cincia dalmatina (Italian)
Cincia mora (Italian)
Cincia siberiana (Italian)
Cinciallegra (Italian)
Cinciarella (Italian)
Ciuffolotto (Italian)
Ciuffolottto delle pinete (Italian)
Civetta (Italian)
Civetta capogrosso (Italian)
Civetta delle nevi (Italian)
Civetta nana (Italian)
Codazzurro (Italian)
Codibugnolo (Italian)
Codirosso (Italian)
Codirosso spazzacamino (Italian)
Codirossone (Italian)
Codone (Italian)
Colombaccio (Italian)
Colombella (Italian)
Combattente (Italian)
Cornacchia grigia (Italian)
Cornacchia nera (Italian)
Corriere asiatico (Italian)
Corriere grosso (Italian)
Corriere piccolo (Italian)
Corvo (Italian)
Corvo imperiale (Italian)
Coturnice (Italian)
Croccolone (Italian)
Crociere delle pinete (Italian)
Crociere fasciato (Italian)
Crociere scozzese (Italian)
Cuculo (Italian)
Cuculo dal ciuffo (Italian)
Culbianco (Italian)
Culbianco isabellino (Italian)
Cutrettola (Italian)
Cutrettola testagialla orientale (Italian)
Calamón común (Spanish)
Calandria aliblanca (Spanish)
Calandria común (Spanish)
Calandria negra (Spanish)
Camachuelo común (Spanish)
Camachuelo picogrueso (Spanish)
Camachuelo trompetero (Spanish)
Canastera (Spanish)
Canastera alinegra (Spanish)
Cárabo (Spanish)
Cárabo lapón (Spanish)
Cárabo uralense (Spanish)
Carbonero común (Spanish)
Carbonero garrapinos (Spanish)
Carbonero lapón (Spanish)
Carbonero lugubre (Spanish)
Carbonero palustre (Spanish)
Carbonero sibilino (Spanish)
Carraca común (Spanish)
Carricerín cejudo (Spanish)
Carricerín común (Spanish)
Carricerín real (Spanish)
Carricero agrícola (Spanish)
Carricero común (Spanish)
Carricero de Blyth (Spanish)
Carricero poliglota (Spanish)
Carricero tordal (Spanish)
Cascanueces (Spanish)
Cerceta carretona (Spanish)
Cerceta común (Spanish)
Cerceta pardilla (Spanish)
Cernícalo patirrojo (Spanish)
Cernícalo primilla (Spanish)
Cernícalo vulgar (Spanish)
Charrán árctico (Spanish)
Charrán común (Spanish)
Charrán patinegro (Spanish)
Charrán rosado (Spanish)
Charrancito (Spanish)
Chocha perdiz (Spanish)
Chochín (Spanish)
Chorlitejo asiático (Spanish)
Chorlitejo chico (Spanish)
Chorlitejo grande (Spanish)
Chorlito carambolo (Spanish)
Chorlito dorado común (Spanish)
Chorlito gris (Spanish)
Chotacabras gris (Spanish)
Chotacabras pardo (Spanish)
Chova piqigualda (Spanish)
Chova piquirroja (Spanish)
Cigüeña común (Spanish)
Cigüeña negra (Spanish)
Cigüeñuela (Spanish)
Cisne cantor (Spanish)
Cisne chico (Spanish)
Cisne vulgar (Spanish)
Cisticole des joncs (Spanish)
Codorniz (Spanish)
Cogujada común (Spanish)
Cogujada montesina (Spanish)
Coliazul cejiblanco (Spanish)
Colimbo (Spanish)
Colimbo arctico (Spanish)
Colimbo chico (Spanish)
Colimbo de Adams (Spanish)
Colirrojo real (Spanish)
Colirrojo tizón (Spanish)
Collalba gris (Spanish)
Collalba isabel (Spanish)
Collalba negra (Spanish)
Collalba pía (Spanish)
Collalba rubia (Spanish)
Combatiente (Spanish)
Cormoran grande (Spanish)
Cormoran moñudo (Spanish)
Cormoran pigmeo (Spanish)
Corneja cenicienta (Spanish)
Corneja negra (Spanish)
Correlimos común (Spanish)
Correlimos de Temminck (Spanish)
Correlimos falcinelo (Spanish)
Correlimos gordo (Spanish)
Correlimos menudo (Spanish)
Correlimos oscuro (Spanish)
Correlimos tridáctylo (Spanish)
Correlimos zarapatín (Spanish)
Críalo (Spanish)
Cuco (Spanish)
Cuervo (Spanish)
Curruca cabecinegra (Spanish)
Curruca capirotada (Spanish)
Curruca carrasqeña (Spanish)
Curruca de Rüppell (Spanish)
Curruca gavilana (Spanish)
Curruca mirlona (Spanish)
Curruca mosquitera (Spanish)
Curruca rabilarga (Spanish)
Curruca sarda (Spanish)
Curruca tomillera (Spanish)
Curruca zarcera (Spanish)
Curruca zarcerilla (Spanish)