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- Bígaro bravo (Littorina saxatilis) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Bígaro común (Littorina littorea) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Bígaro chato (Littorina obtusata) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Bígaro enano (caracolillo negro) (Melarhaphe neritoides) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Bighorn (carnero de las montañas Rocosas) (Ovis canadensis) [CHORDATA, Mammalia, Artiodactyla]
- Bigotudo:
- Bigotudo común (Panurus biarmicus) [CHORDATA, Aves, Passeriformes]
- Bigotudo chino (Suthora webbiana) [CHORDATA, Aves, Passeriformes]
- Bigotudo de Blyth (Suthora blythi) [CHORDATA, Aves, Passeriformes]
- Bigotudo de cabeza gris (Psilopogon flavifrons) [CHORDATA, Aves, Piciformes]
- Bigotudo de frente negra (Psilopogon nigrifrons) [CHORDATA, Aves, Piciformes]
- Bigotudo de Gould (Psilopogon haemacephalus) [CHORDATA, Aves, Piciformes]
- Bilby (bandicut) (Macrotis lagotis) [CHORDATA, Mammalia, Peramelemorphia]
- Binturong (Arctictis binturong) [CHORDATA, Mammalia, Carnivora]
- Biquir (políptero) (Polypterus senegalus) [CHORDATA, Actinopterygii, Polypteriformes]
- Bisbita:
- Bisbita arbóreo (Anthus trivialis) [CHORDATA, Aves, Passeriformes]
- Bisbita campestre (Anthus campestris) [CHORDATA, Aves, Passeriformes]
- Bisbita común (Anthus pratensis) [CHORDATA, Aves, Passeriformes]
- Bisbita de Bogotá (Anthus bogotensis) [CHORDATA, Aves, Passeriformes]
- Bisbita de los pastizales (Anthus spragueii) [CHORDATA, Aves, Passeriformes]
- Bisbita de pecho amarillo (Anthus lutescens) [CHORDATA, Aves, Passeriformes]
- Bisbita de Richard (Anthus richardi) [CHORDATA, Aves, Passeriformes]
- Bisbita dorado (Anthus cervinus) [CHORDATA, Aves, Passeriformes]
- Bisbita ribereño (Anthus spinoletta) [CHORDATA, Aves, Passeriformes]
- Bisonte:
- Bisonte americano (Bison bison) [CHORDATA, Mammalia, Artiodactyla]
- Bisonte de bosque (Bison bison athabascae) [CHORDATA, Mammalia, Artiodactyla]
- Bisonte de la pradera (Bison bison bison) [CHORDATA, Mammalia, Artiodactyla]
- Bisonte europeo (Bison bonasus) [CHORDATA, Mammalia, Artiodactyla]
- Bitterling (bermejuela amarga) (Rhodeus amarus) [CHORDATA, Actinopterygii, Cypriniformes]
- Blanca del majuelo (piéridos) (Aporia crataegi) [ARTHROPODA, Insecta, Lepidoptera]
- Blanca esbelta (piéridos) (Leptidea sinapis) [ARTHROPODA, Insecta, Lepidoptera]
- Blanquiverdosa alpina (Pontia callidice) [ARTHROPODA, Insecta, Lepidoptera]
- Blaubok (hipotrago) (Hippotragus leucophaeus) [CHORDATA, Mammalia, Artiodactyla]
- Blenio:
- Blenio común (Lipophrys pholis) [CHORDATA, Actinopterygii, Blenniiformes]
- Blenio vivíparo (zoarces) (Zoarces viviparus) [CHORDATA, Actinopterygii, Perciformes]
- Blenio anguila (Blennius ocellaris) [CHORDATA, Actinopterygii, Blenniiformes]
- Blesbok (Damaliscus pygargus phillipsi) [CHORDATA, Mammalia, Artiodactyla]
- Blesmoll (rata topo) (Cryptomys hottentotus) [CHORDATA, Mammalia, Rodentia]
- Boa:
- Boa constrictor (Boa constrictor) [CHORDATA, Reptilia, Squamata]
- Boa de California (Charina bottae) [CHORDATA, Reptilia, Squamata]
- Boa desertícola (Lichanura trivirgata) [CHORDATA, Reptilia, Squamata]
- Boa esmeralda (Corallus caninus) [CHORDATA, Reptilia, Squamata]
- Bobi (Canis lupus familiaris) [CHORDATA, Mammalia, Carnivora]
- Boca de fuego (chanchito) (Thorichthys meeki) [CHORDATA, Actinopterygii, Cichliformes]
- Bocanegra (Ramphocelus carbo) [CHORDATA, Aves, Passeriformes]
- Bodión (Symphodus tinca) [CHORDATA, Actinopterygii, Labriformes]
- Bodión verde (lábridos) (Thalassoma pavo) [CHORDATA, Actinopterygii, Labriformes]
- Boga (Chondrostoma nasus) [CHORDATA, Actinopterygii, Cypriniformes]
- Bogavante:
- Bogavante común (Homarus gammarus) [ARTHROPODA, Crustacea, Decapoda]
- Bogavante (langosta de mar) (Palinurus elephas) [ARTHROPODA, Crustacea, Decapoda]
- Bongo (Tragelaphus eurycerus) [CHORDATA, Mammalia, Artiodactyla]
- Bonito (Sarda sarda) [CHORDATA, Actinopterygii, Scombriformes]
- Bonito del Norte (atún) (Thunnus alalunga) [CHORDATA, Actinopterygii, Scombriformes]
- Bontebok (Damaliscus pygargus pygargus) [CHORDATA, Mammalia, Artiodactyla]
- Boquerón (Engraulis encrasicolus) [CHORDATA, Actinopterygii, Clupeiformes]
- Boquidulce (Astyanax mexicanus) [CHORDATA, Actinopterygii, Characiformes]
- Borracho (cuclillo) (Coccyzus americanus) [CHORDATA, Aves, Cuculiformes]
- Bovinos (toro y vaca) (Bos taurus) [CHORDATA, Mammalia, Artiodactyla]
- Braquiópodos (Terebratulina retusa) [BRACHIOPODA, Rhynchonelliformea, Terebratulida]
- Brema:
- Brema blanca (b. plateada) (Blicca bjoerkna) [CHORDATA, Actinopterygii, Cypriniformes]
- Brema común (Abramis brama) [CHORDATA, Actinopterygii, Cypriniformes]
- Brema de mar (Acanthopagrus australis) [CHORDATA, Actinopterygii, Perciformes]
- Briozoos:
- Briozoos de agua dulce (Plumatella repens) [BRYOZOA, Phylactolaemata, Plumatellida]
- Brocado (Pterophyllum scalare) [CHORDATA, Actinopterygii, Cichliformes]
- Brolga (grulla) (Antigone rubicunda) [CHORDATA, Aves, Gruiformes]
- Broma (taraza) (Taraxacum officinale) [PLANTAE, Magnoliopsida, Asterales]
- Bruang (oso malayo) (Helarctos malayanus) [CHORDATA, Mammalia, Carnivora]
- Buccinos:
- Buccinos acanalado (Neptunea antiqua) [MOLLUSCA, Gastropoda, Neogastropoda]
- Buccinos áspero americano (Urosalpinx cinerea) [MOLLUSCA, Gastropoda, Neogastropoda]
- Buccinos común (b. blanco) (Buccinum undatum) [MOLLUSCA, Gastropoda, Neogastropoda]
- Buccinos de aguja (Colus jeffreysianus) [MOLLUSCA, Gastropoda, Neogastropoda]
- Buccinos pesados (Neptunea contraria) [MOLLUSCA, Gastropoda, Neogastropoda]
- Buccinos rojos (b. almendra) (Nassarius reticulatus) [MOLLUSCA, Gastropoda, Neogastropoda]
- Bulcónidos (Bulimus spp.) [MOLLUSCA, Gastropoda, Stylommatophora]
- Budell (Budellus spp.) [CHORDATA, Actinopterygii, Siluriformes]
- Buey (toro y vaca) (Bos taurus) [CHORDATA, Mammalia, Artiodactyla]
- Buey (cangrejo buey, crustáceo) (Cancer pagurus) [ARTHROPODA, Crustacea, Decapoda]
- Buey almizclado (Ovibos moschatus) [CHORDATA, Mammalia, Artiodactyla]
- Bufago:
- Bufago de pico amarillo (Buphagus africanus) [CHORDATA, Aves, Passeriformes]
- Bufago de pico rojo (Buphagus erythrorhynchus) [CHORDATA, Aves, Passeriformes]
- Búfalo (Syncerus caffer) [CHORDATA, Mammalia, Artiodactyla
- Búfalo asiático:
- Búfalo asiático indio (b. acuático, carabao) (Bubalus bubalis) [CHORDATA, Mammalia, Artiodactyla]
- Búfalo cafre:
- Búfalo cafre de bosque (Syncerus caffer nanus) [CHORDATA, Mammalia, Artiodactyla]
- Búho nival (Bubo scandiacus) [CHORDATA, Aves, Strigiformes]
- Búho poderoso (Ninox strenua) [CHORDATA, Aves, Strigiformes]
- Buitre:
- Buitre común (Gyps fulvus) [CHORDATA, Aves, Accipitriformes]
- Buitre de Angola (b. de la palmera de aceite) (Gypohierax angolensis) [CHORDATA, Aves, Accipitriformes]
- Buitre de cabeza blanca (Trigonoceps occipitalis) [CHORDATA, Aves, Accipitriformes]
- Buitre de cara lobulada (Torgos tracheliotos) [CHORDATA, Aves, Accipitriformes]
- Buitre de dorso blanco (Gyps africanus) [CHORDATA, Aves, Accipitriformes]
- Buitre de El Cabo (Gyps coprotheres) [CHORDATA, Aves, Accipitriformes]
- Buitre egipcio (alimoche) (Neophron percnopterus) [CHORDATA, Aves, Accipitriformes]
- Buitre indio (Gyps indicus) [CHORDATA, Aves, Accipitriformes]
- Buitre monje (b. encapuchado) (Aegypius monachus) [CHORDATA, Aves, Accipitriformes]
- Buitre negro asiático (Aegypius monachus) [CHORDATA, Aves, Accipitriformes]
- Buitre negro de la India (sucuni) (Aegypius monachus) [CHORDATA, Aves, Accipitriformes]
- Buitre negro europeo (Aegypius monachus) [CHORDATA, Aves, Accipitriformes]
- Buitre barbudo (quebrantahuesos) (Gypaetus barbatus) [CHORDATA, Aves, Accipitriformes]
- Buitrón (Cisticola juncidis) [CHORDATA, Aves, Passeriformes]
- Bulbul:
- Bulbul africano (Pycnonotus barbatus) [CHORDATA, Aves, Passeriformes]
- Bulbul cariblanco (Pycnonotus leucotis) [CHORDATA, Aves, Passeriformes]
- Bulbul cuellirrojo (Pycnonotus cafer) [CHORDATA, Aves, Passeriformes]
- Bulbul culirrojo (Pycnonotus jocosus) [CHORDATA, Aves, Passeriformes]
- Bulbul de cresta negra (Rubigula flaviventris) [CHORDATA, Aves, Passeriformes]
- Bulbul negro (Hypsipetes leucocephalus) [CHORDATA, Aves, Passeriformes]
- Bulbul pardo (b. verde) (Pycnonotus xanthopygos) [CHORDATA, Aves, Passeriformes]
- Bulbul terrero (Phyllastrephus terrestris) [CHORDATA, Aves, Passeriformes]
- Bunder (macaco) (Macaca mulatta) [CHORDATA, Mammalia, Primates]
- Burlón:
- Burlón azul (Mimus gilvus) [CHORDATA, Aves, Passeriformes]
- Burlón de los Galápagos (Mimus parvulus) [CHORDATA, Aves, Passeriformes]
- Burlón norteño (sinsonte) (Mimus polyglottos) [CHORDATA, Aves, Passeriformes]
- Buscarla pintoja (Locustella naevia) [CHORDATA, Aves, Passeriformes]
- Butú (delfín fluvial) (Inia geoffrensis) [CHORDATA, Mammalia, Cetacea]
Página en construcción
- Caballa:
- Caballa común europea (Scomber scombrus) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa del Pacífico (Scomber japonicus) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa enana (Rastrelliger brachysoma) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa escrita (Scomberomorus maculatus) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa japonesa (Scomber australasicus) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa moteada (Scomberomorus maculatus) [CHORDATA, Actinopterygii, Scombriformes]
- Caballa serpiente (Gempylus serpens) [CHORDATA, Actinopterygii, Gempyliformes]
- Caballito de mar (Hippocampus hippocampus) [CHORDATA, Actinopterygii, Syngnathiformes]
- Caballito del diablo (Calopteryx virgo) [ARTHROPODA, Insecta, Odonata]
- Caballo:
- Caballo de Przewalski (caballo salvaje de Mongolia) (Equus ferus przewalskii) [CHORDATA, Mammalia, Perissodactyla]
- Caballo marino (Syngnathus acus) [CHORDATA, Actinopterygii, Syngnathiformes]
- Cabete (Kyphosus sectatrix) [CHORDATA, Actinopterygii, Perciformes]
- Cabeza de León (Oryctolagus cuniculus, raza Lionhead) [CHORDATA, Mammalia, Lagomorpha]
- Cabezatoro (coto europeo) (Bos taurus) [CHORDATA, Mammalia, Artiodactyla]
- Cabezón (Scorpaenichthys marmoratus) [CHORDATA, Actinopterygii, Scorpaeniformes]
- Cabezón (mola) (Mola mola) [CHORDATA, Actinopterygii, Tetraodontiformes]
- Cabra:
- Cabra montés hispánica (c. ibérica) (Capra pyrenaica hispanica) [CHORDATA, Mammalia, Artiodactyla]
- Cabra (cangrejo de mar) (Eriphia verrucosa) [CHORDATA, Malacostraca, Decapoda]
- Cabra bezoar (c. salvaje, c. montés) (Capra aegagrus) [CHORDATA, Mammalia, Artiodactyla]
- Cabra de Abisinia (gran, ualí) (Capra walie) [CHORDATA, Mammalia, Artiodactyla]
- Cabra montés (íbice) (Capra ibex) [CHORDATA, Mammalia, Artiodactyla]
- Cabracho (Scorpaena scrofa) [CHORDATA, Actinopterygii, Scorpaeniformes]
- Cabrilla (Serranus cabrilla) [CHORDATA, Actinopterygii, Perciformes]
- Cabruza (adusto) (Serranus atricauda) [CHORDATA, Actinopterygii, Perciformes]
- Cabuxino (Gobius paganellus) [CHORDATA, Actinopterygii, Gobiiformes]
- Cacatúa:
- Cacatúa de cresta amarilla (Cacatua galerita) [CHORDATA, Aves, Psittaciformes]
- Cacatúa de cresta escarlata (Cacatua sulphurea) [CHORDATA, Aves, Psittaciformes]
- Cacatúa de pecho rosado (Eolophus roseicapilla) [CHORDATA, Aves, Psittaciformes]
- Cacatúa negra (Probosciger aterrimus) [CHORDATA, Aves, Psittaciformes]
- Cacatúa negroamarilla (Calyptorhynchus funereus) [CHORDATA, Aves, Psittaciformes]
- Cacerola de las Molucas (Cacatua moluccensis) [CHORDATA, Aves, Psittaciformes]
- Cacique:
- Cacique dorsiamarillo (Cacicus cela) [CHORDATA, Aves, Passeriformes]
- Cacomisel (basáride) (Bassariscus astutus) [CHORDATA, Mammalia, Carnivora]
- Cacomixtle (basáride) (Bassariscus sumichrasti) [CHORDATA, Mammalia, Carnivora]
- Cachalote:
- Cachalote enano (Kogia sima) [CHORDATA, Mammalia, Cetacea]
- Cacho:
- Cacho de cabeza plana (Squalius cephalus) [CHORDATA, Actinopterygii, Cypriniformes]
- Cachoreta (Trachurus trachurus) [CHORDATA, Actinopterygii, Carangiformes]
- Cadio (Gobius niger) [CHORDATA, Actinopterygii, Gobiiformes]
- Caguán (Penelope purpurascens) [CHORDATA, Aves, Galliformes]
- Cailón:
- Cailón común (Lamna nasus) [CHORDATA, Chondrichthyes, Lamniformes]
- Cailón del Pacífico (tiburón salmón) (Lamna ditropis) [CHORDATA, Chondrichthyes, Lamniformes]
- Caimán:
- Caimán almizclado (Paleosuchus palpebrosus) [CHORDATA, Reptilia, Crocodylia]
- Caimán de anteojos (Caiman crocodilus) [CHORDATA, Reptilia, Crocodylia]
- Caimán de frente lisa (Paleosuchus trigonatus) [CHORDATA, Reptilia, Crocodylia]
- Caimán de hocico ancho (yacaré) (Caiman latirostris) [CHORDATA, Reptilia, Crocodylia]
- Caimán negro (Melanosuchus niger) [CHORDATA, Reptilia, Crocodylia]
- Calamar (Loligo vulgaris) [MOLLUSCA, Cephalopoda, Teuthida]
- Calamón:
- Calamón americano (Porphyrio martinicus) [CHORDATA, Aves, Gruiformes]
- Calamón común (Porphyrio porphyrio) [CHORDATA, Aves, Gruiformes]
- Calamón de Allen (Porphyrio alleni) [CHORDATA, Aves, Gruiformes]
- Calandino (Aphanius iberus) [CHORDATA, Actinopterygii, Cyprinodontiformes]
- Cálao:
- Cálao coronado (Buceros bicornis) [CHORDATA, Aves, Bucerotiformes]
- Cálao de casco blanco y negro (Anthracoceros albirostris) [CHORDATA, Aves, Bucerotiformes]
- Cálao de cresta blanca (Anthracoceros albirostris) [CHORDATA, Aves, Bucerotiformes]
- Cálao de cuello rojo (Aceros nipalensis) [CHORDATA, Aves, Bucerotiformes]
- Cálao de Leadbeter (Rhyticeros plicatus) [CHORDATA, Aves, Bucerotiformes]
- Cálao de mejillas plateadas (Bycanistes subcylindricus) [CHORDATA, Aves, Bucerotiformes]
- Cálao de pico amarillo (Tockus flavirostris) [CHORDATA, Aves, Bucerotiformes]
- Cálao enano (Tockus camurus) [CHORDATA, Aves, Bucerotiformes]
- Cálao enano de pico rojo (Tockus rufirostris) [CHORDATA, Aves, Bucerotiformes]
- Cálao malayo (Anthracoceros malayanus) [CHORDATA, Aves, Bucerotiformes]
- Calcídidos (familia Chalcididae) [ARTHROPODA, Insecta, Hymenoptera]
- Calderón (Globicephala melas) [CHORDATA, Mammalia, Cetacea]
- Calicó (Pseudanthias squamipinnis) [CHORDATA, Actinopterygii, Perciformes]
- Calotes verde crestado (Calotes calotes) [CHORDATA, Reptilia, Squamata]
- Calvo:
- Calvo del Camerún (picatartes calvo) (Picathartes oreas) [CHORDATA, Aves, Passeriformes]
- Calvo de cuello blanco (Leptoptilos dubius) [CHORDATA, Aves, Ciconiiformes]
- Calvo de cuello gris (Leptoptilos javanicus) [CHORDATA, Aves, Ciconiiformes]
- Camachuelo común (Pyrrhula pyrrhula) [CHORDATA, Aves, Passeriformes]
- Camaleón:
- Camaleón común (Chamaeleo chamaeleon) [CHORDATA, Reptilia, Squamata]
- Camaleón de babero (Chamaeleo dilepis) [CHORDATA, Reptilia, Squamata]
- Camaleón de Jackson (Trioceros jacksonii) [CHORDATA, Reptilia, Squamata]
- Camaleón enano (Brookesia minima) [CHORDATA, Reptilia, Squamata]
- Camaleón tricorne (Trioceros jacksonii xantholophus) [CHORDATA, Reptilia, Squamata]
- Camaleón americano (anolis) (Anolis carolinensis) [CHORDATA, Reptilia, Squamata]
- Camarón:
- Camarón común (Crangon crangon) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón costurero (Stenopus hispidus) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón de agua dulce (Macrobrachium amazonicum) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón detonante (Alpheus heterochaelis) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón gigante de agua dulce (Macrobrachium rosenbergii) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón limpiador (Lysmata amboinensis) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón ballenero (krill) (Nematocarcinus ensifer) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón nodriza (galera) (Palaemonetes paludosus) [ARTHROPODA, Malacostraca, Decapoda]
- Camarón zarigüeya (misis) (Gnathophyllum americanum) [ARTHROPODA, Malacostraca, Decapoda]
- Cámbaro:
- Cámbaro (cangrejo de mar común) (Carcinus maenas) [ARTHROPODA, Crustacea, Malacostraca, Decapoda]
- Cámbaro mazorgano (Procambarus clarkii) [ARTHROPODA, Malacostraca, Decapoda]
- Cámbaro volador (Orconectes virilis) [ARTHROPODA, Malacostraca, Decapoda]
- Camello:
- Camello arábigo (c. de Arabia, c. de una giba) (Camelus dromedarius) [CHORDATA, Mammalia, Artiodactyla]
- Camello bactriano (c. de dos gibas) (Camelus bactrianus) [CHORDATA, Mammalia, Artiodactyla]
- Camello salvaje (Camelus ferus) [CHORDATA, Mammalia, Artiodactyla]
- Campanero:
- Campanero alinegro (Procnias averano) [CHORDATA, Aves, Passeriformes]
- Campanero blanco (campanero común, araponga blanco) (Procnias albus) [CHORDATA, Aves, Passeriformes]
- Campanero de garganta desnuda (c. herrero) (Procnias nudicollis) [CHORDATA, Aves, Passeriformes]
- Campanero de Rieffer (Procnias riefferi) [CHORDATA, Aves, Passeriformes
- Campanero tricarunculado (Procnias tricarunculatus) [CHORDATA, Aves, Passeriformes]
- Campanero australiano:
- Campanero australiano crestado (Psophodes cristatus) [CHORDATA, Aves, Passeriformes]
- Campanero australiano de Nueva Zelanda (Callaeas cinereus) [CHORDATA, Aves, Passeriformes]
- Campanero australiano tricarunculado (Callaeas wilsoni) [CHORDATA, Aves, Passeriformes]
- Canario:
- Canario crestado (Serinus canaria domestica) [CHORDATA, Aves, Passeriformes]
- Canario flauta (Serinus canaria) [CHORDATA, Aves, Passeriformes]
- Canastera:
- Canastera australiana (Glareola maldivarum) [CHORDATA, Aves, Charadriiformes]
- Canastera de alas negras (Glareola nordmanni) [CHORDATA, Aves, Charadriiformes]
- Canastera de collar (Glareola pratincola) [CHORDATA, Aves, Charadriiformes]
- Canastera de los prados (Glareola ocularis) [CHORDATA, Aves, Charadriiformes]
- Candil:
- Candil listado (Myctophum punctatum) [CHORDATA, Actinopterygii, Myctophiformes]
- Candil pensativo (Electrona risso) [CHORDATA, Actinopterygii, Myctophiformes]
- Candirú (Vandellia cirrhosa) [CHORDATA, Actinopterygii, Siluriformes]
- Cangrejito cavador (Uca pugilator) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo:
- Cangrejo araña (Maja squinado) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo araña arlequín (Lybia tessellata) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo buey (Cancer pagurus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo azul (Callinectes sapidus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo chino (Eriocheir sinensis) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo japonés (Macrocheira kaempferi) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de los cocoteros (Birgus latro) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de mar común:
- Cangrejo de mar común europeo (Carcinus maenas) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de mar común cornudo (Hemigrapsus sanguineus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de mar común corredor (Pachygrapsus marmoratus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de mar común moruno (cabra) (Eriphia verrucosa) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de río:
- Cangrejo de río americano (Procambarus clarkii) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de río común (c. rojo) (Astacus astacus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de río noble (Astacus leptodactylus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo de río de torrente (Austropotamobius torrentium) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño:
- Cangrejo ermitaño de hondura (Pagurus prideaux) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño de pinza surcada (Pagurus bernhardus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño guerrero (Clibanarius vittatus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño ladrón (c.de los cocoteros) (Birgus latro) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño multicolor (anacoreta) (Clibanarius tricolor) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño ocelado (Dardanus megistos) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño roquero (c. de roca) (Pagurus cuanensis) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo ermitaño soldado (Paguristes cadenati) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo moruno (Eriphia verrucosa) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo rey (cacerola de las Moluscas) (Paralithodes camtschaticus) [ARTHROPODA, Malacostraca, Decapoda]
- Cangrejo violinista (Uca pugnax) [ARTHROPODA, Malacostraca, Decapoda]
- Canguro:
- Canguro de la isla de Kangaroo (Macropus fuliginosus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro de Tasmania (c. forestal) (Macropus rufogriseus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro gigante (gran canguro gris, montaraz del sudoeste) (Macropus giganteus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro liebre (Lagorchestes conspicillatus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata (Bettongia penicillata) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rojo (Osphranter rufus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rupestre (Petrogale xanthopus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro arborícola:
- Canguro arborícola de Bennet (Dendrolagus bennettianus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro arborícola de Nueva Guinea (Dendrolagus goodfellowi) [CHORDATA, Mammalia, Diprotodontia]
- Canguro arborícola de Lumholtz (Dendrolagus lumholtzi) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata:
- Canguro rata almizclado (Bettongia penicillata) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata de hocico corto (Potorous tridactylus) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata de hocico largo (potoro) (Potorous longipes) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata del desierto (Caloprymnus campestris) [CHORDATA, Mammalia, Diprotodontia]
- Canguro rata leonado (bermejo) (Aepyprymnus rufescens) [CHORDATA, Mammalia, Diprotodontia]
- Cano (Boops boops) [CHORDATA, Actinopterygii, Perciformes]
- Cantárida:
- Cantárida (Lytta vesicatoria) [ARTHROPODA, Insecta, Coleoptera]
- Cantárida comín (Mylabris pustulata) [ARTHROPODA, Insecta, Coleoptera]
- Cantárida india (Epicauta hirticornis) [ARTHROPODA, Insecta, Coleoptera]
- Cantárida sudafricana (Hycleus lunatus) [ARTHROPODA, Insecta, Coleoptera]
- Cañabota (Hexanchus griseus) [CHORDATA, Chondrichthyes, Hexanchiformes]
- Caperuza (Sylvia atricapilla) [CHORDATA, Aves, Passeriformes]
- Capibara (carpincho) (Hydrochoerus hydrochaeris) [CHORDATA, Mammalia, Rodentia]
- Capuchino:
- Capuchino llorón (Cebus olivaceus) [CHORDATA, Mammalia, Primates]
- Capuchino (ave):
- Capuchino (enanito) (Lonchura spp.) [CHORDATA, Aves, Passeriformes]
- Capuchino damero (pájaro especiero, munia moteada) (Lonchura punctulata) [CHORDATA, Aves, Passeriformes]
- Capuchino de alas bronceadas (Lonchura molucca) [CHORDATA, Aves, Passeriformes]
- Capuchino de alas de plata común (Lonchura cantans) [CHORDATA, Aves, Passeriformes]
- Capuchino de Bengala (Lonchura striata) [CHORDATA, Aves, Passeriformes]
- Capuchino del Japón (Lonchura domestica) [CHORDATA, Aves, Passeriformes]
- Capuchino de pechero (Lonchura bicolor) [CHORDATA, Aves, Passeriformes]
- Capuchino de pecho castaño (Lonchura castaneothorax) [CHORDATA, Aves, Passeriformes]
- Capuchino pardo (c. tostado) (Lonchura ferruginosa) [CHORDATA, Aves, Passeriformes]
- Capuchino urraca (gran capuchino) (Lonchura grandis) [CHORDATA, Aves, Passeriformes]
- Cara rayada (tutacusillo) (Arremonops conirostris) [CHORDATA, Aves, Passeriformes]
- Carabao:
- Carabao (búfalo asiático) (Bubalus bubalis carabanesis) [CHORDATA, Mammalia, Artiodactyla]
- Carabao (búfalo indio) (Bubalus bubalis bubalis) [CHORDATA, Mammalia, Artiodactyla]
- Carabela portuguesa:
- Carabela portuguesa del Atlántico (Physalia physalis) [CNIDARIA, Hydrozoa, Siphonophorae]
- Carabela portuguesa del Pacífico e Índico (Physalia utriculus) [CNIDARIA, Hydrozoa, Siphonophorae]
- Carábido:
- Carábido cazador de orugas (Calosoma sycophanta) [ARTHROPODA, Insecta, Coleoptera]
- Carábido sudafricano (Anthia thoracica) [ARTHROPODA, Insecta, Coleoptera]
- Carábido violeta (Carabus violaceus) [ARTHROPODA, Insecta, Coleoptera]
- Cárabo común (Strix aluco) [CHORDATA, Aves, Strigiformes]
- Caracal (Caracal caracal) [CHORDATA, Mammalia, Carnivora]
- Caracaras:
- Caracaras carunculado (Phalcoboenus carunculatus) [CHORDATA, Aves, Falconiformes]
- Caracaras común (c. de Audubon) (Caracara plancus) [CHORDATA, Aves, Falconiformes]
- Caracaras chimango (Milvago chimango) [CHORDATA, Aves, Falconiformes]
- Caracaras de cabeza amarilla (Milvago chimachima) [CHORDATA, Aves, Falconiformes]
- Caracaras de cuello amarillo (Phalcoboenus albogularis) [CHORDATA, Aves, Falconiformes]
- Caracaras de cuello rojo (Phalcoboenus megalopterus) [CHORDATA, Aves, Falconiformes]
- Caracaras de Guadalupe (Caracara lutosa) [CHORDATA, Aves, Falconiformes]
- Caracaras estriado (Ibycter americanus) [CHORDATA, Aves, Falconiformes]
- Caracino transparente (Hyphessobrycon anisitsi) [CHORDATA, Actinopterygii, Characiformes]
- Caracinos:
- Caracinos de cola de espada (Xiphophorus hellerii) [CHORDATA, Actinopterygii, Cyprinodontiformes]
- Caracinos espumante (c. rociador) (Copella arnoldi) [CHORDATA, Actinopterygii, Characiformes]
- Caracinos transparente (Hyphessobrycon spp.) [CHORDATA, Actinopterygii, Characiformes]
- Caracol de Borgoña:
- Caracol de Borgoña común (Helix pomatia) [MOLLUSCA, Gastropoda, Stylommatophora]
- Caracol de Borgoña de huerta (caracol de huerta) (Helix aspersa) [MOLLUSCA, Gastropoda, Stylommatophora]
- Caracol de jardín (Cornu aspersum) [MOLLUSCA, Gastropoda, Stylommatophora]
- Caracol de los estanques (gran) (Lymnaea stagnalis) [MOLLUSCA, Gastropoda, Hygrophila]
- Caracol de trompeta:
- Caracol de trompeta de vejiga (Bithynia tentaculata) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Caracol de trompeta glutinoso (Melanoides tuberculata) [MOLLUSCA, Gastropoda, Cerithioidea]
- Caracol listado (Cepaea nemoralis) [MOLLUSCA, Gastropoda, Stylommatophora]
- Caracol púrpura (yantina) (Bolinus brandaris) [MOLLUSCA, Gastropoda, Neogastropoda]
- Caracol serpentino (vermeto) (Neritina natalensis) [MOLLUSCA, Gastropoda, Neritopsina]
- Caracol tubícola (vermeto) (Vermetus spp.) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Caracol vermiforme (vermeto) (Vermetidae spp.) [MOLLUSCA, Gastropoda, Littorinimorpha]
- Caracol violeta (yantina) (Janthina janthina) [MOLLUSCA, Gastropoda, Euthyneura]
- Caracolero (Rostrhamus sociabilis) [CHORDATA, Aves, Accipitriformes]
- Caracolillo:
- Caracolillo de nácar (Nerita peloronta) [MOLLUSCA, Gastropoda, Neritopsina]
- Caracolillo negro (bígaro) (Nerita fulgurans) [MOLLUSCA, Gastropoda, Neritopsina]
- Carau (viuda loca) (Aramus guarauna) [CHORDATA, Aves, Gruiformes]
- Carbonero:
- Carbonero cabecinegro (Poecile palustris) [CHORDATA, Aves, Passeriformes]
- Carbonero común (Parus major) [CHORDATA, Aves, Passeriformes]
- Carbonero palustre (Poecile palustris) [CHORDATA, Aves, Passeriformes]
- Carbonero sibilino (Poecile montanus) [CHORDATA, Aves, Passeriformes]
- Carbonero tropical (Melaniparus niger) [CHORDATA, Aves, Passeriformes]
- Cardenal:
- Cardenal de cuello negro (Paroaria gularis) [CHORDATA, Aves, Passeriformes]
- Cardenal malgache (Foudia madagascariensis) [CHORDATA, Aves, Passeriformes]
- Cardenal (pez) (Apogon imberbis) [CHORDATA, Actinopterygii, Kurtiformes]
- Caretoquelis (Carettochelys insculpta) [CHORDATA, Reptilia, Testudines]
- Carey (Eretmochelys imbricata) [CHORDATA, Reptilia, Testudines]
- Cariacos (Haemulon spp.) [CHORDATA, Actinopterygii, Perciformes]
- Cariama (seriema) (Cariama cristata) [CHORDATA, Aves, Cariamiformes]
- Caribú (Rangifer tarandus) [CHORDATA, Mammalia, Artiodactyla]
- Carnero:
- Carnero (Carneiro, oveja doméstica) (Ovis orientalis aries) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface Border Leicester (Ovis aries, raza Border Leicester) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface de Ausimi (Ovis aries, raza Ausimi) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface de Dall (Ovis dalli) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface de Lincoln (Ovis aries, raza Lincoln) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface merino (Ovis aries, raza Merino) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface merino hispánico (Ovis aries, raza Merino español) [CHORDATA, Mammalia, Artiodactyla]
- Carnero Blackface Wensleydale (Ovis aries, raza Wensleydale) [CHORDATA, Mammalia, Artiodactyla]
- Carnero de las montañas Rocosas (Ovis canadensis) [CHORDATA, Mammalia, Artiodactyla]
- Carpa:
- Carpa carusiana (c. prusiana) (Carassius gibelio) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpa de cuero (Cyprinus carpio) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpa de Chipre (Cyprinus carpio) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpa de espejo (Cyprinus carpio) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpa silvestre (Cyprinus carpio) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpín dorado (Carassius auratus) [CHORDATA, Actinopterygii, Cypriniformes]
- Carpincho (Hydrochoerus hydrochaeris) [CHORDATA, Mammalia, Rodentia]
- Carraca:
- Carraca cuclillo (Eurystomus glaucurus) [CHORDATA, Aves, Coraciiformes]
- Carraca de Abisinia (c. Senegal) (Coracias abyssinicus) [CHORDATA, Aves, Coraciiformes]
- Carraca de pico ancho (Eurystomus gularis) [CHORDATA, Aves, Coraciiformes]
- Carraca de pico lila (Coracias caudatus) [CHORDATA, Aves, Coraciiformes]
- Carraca de tierra (Coracias naevius) [CHORDATA, Aves, Coraciiformes]
- Carraca europea (Coracias garrulus) [CHORDATA, Aves, Coraciiformes]
- Carranchina (Glaucidium brasilianum) [CHORDATA, Aves, Strigiformes]
- Carricerín real (Acrocephalus melanopogon) [CHORDATA, Aves, Passeriformes]
- Carricero:
- Carricero común (Acrocephalus scirpaceus) [CHORDATA, Aves, Passeriformes]
- Carricero tordal (Acrocephalus arundinaceus) [CHORDATA, Aves, Passeriformes]
- Cascaalmejas (Cardita calyculata) [MOLLUSCA, Bivalvia, Carditida]
- Cascanueces:
- Cascanueces de Clark (c. norteamericano) (Nucifraga columbiana) [CHORDATA, Aves, Passeriformes]
- Cascanueces de pico fino (Nucifraga multipunctata) [CHORDATA, Aves, Passeriformes]
- Cascanueces de pico grueso (Nucifraga hemispila) [CHORDATA, Aves, Passeriformes]
- Cascanueces europeo y asiático (Nucifraga caryocatactes) [CHORDATA, Aves, Passeriformes]
- Caserote:
- Caserote de garganta blanca (Melanopareia maximiliani) [CHORDATA, Aves, Passeriformes]
- Caserote pardo (Melanopareia elegans) [CHORDATA, Aves, Passeriformes]
- Castañuela (japuta, negrita, soldado azul) (Brama brama) [CHORDATA, Actinopterygii, Perciformes]
- Castor:
- Castor canadiense (Castor canadensis) [CHORDATA, Mammalia, Rodentia]
- Castor europeo (Castor fiber) [CHORDATA, Mammalia, Rodentia]