• Cordiopsis polytropa nysti (d'Orbigny, 1852)
• Cornu aspersum (O. F. Müller, 1774) segrijnslak
  garden snail
  
• Cornuproetus sp. Richter & Richter, 1919 trilobiet
  trilobite
  
• Coronella austriaca Laurenti, 1768 gladde slang
  smooth snake
  
• Coronula diadema (Linnaeus, 1767) zeepok
  barnacle
  
• Coronula reginae Darwin, 1854 zeepok
  barnacle
  
• Corvus corax Linnaeus, 1758 raaf
  common raven
  
• Corvus cornix Linnaeus, 1758 bonte kraai
  hooded crow
  
• Corvus corone Linnaeus, 1758 zwarte kraai
  carrion crow
  
• Corvus frugilegus Linnaeus, 1758 roek
  rook
  
• Corvus monedula Linnaeus, 1758 kauw
  western jackdaw
  
• Corylus avellana L. hazelaar
  common hazel
  
• Coryphaena hippurus (Linnaeus, 1758) goudmakreel
  mahi-mahi
  
• Cossypha natalensis Smith, 1840 roodkoplawaaimaker
  red-capped robin-chat
  
• Coturnix coturnix (Linnaeus, 1758) kwartel
  common quail
  
• Couratari calycina Sandwith
• Cranae luctuosa Bolívar, 1923 veldsprinkhaan
  grasshopper
  
• Creophilus maxillosus (Linnaeus, 1758) hairy rove beetle
  grauwe aaskortschild
  
• Crepidula fornicata (Linnaeus, 1758) muiltje
  slipper limpet
  
• Cricetus cricetus (Linnaeus, 1758) hamster
  European hamster
  
• crocidoliet crocidoliet
  crocidolite
  
• Crocidura russula (Hermann, 1780) huisspitsmuis
  white-toothed shrew
  
• Crocodylus niloticus Laurenti, 1768 nijlkrokodil
  Nile crocodile
  
• Crocodylus porosus Schneider, 1801 saltwater crocodile
  zoutwaterkrokodil
  
• Crocodylus siamensis Schneider, 1801 Siamese krokodil
  Siamese crocodile
  
• Crocuta crocuta Erxleben, 1777 gevlekte hyena
  spotted hyena
  
• Crocuta crocuta spelaea Goldfuss, 1823 grottenhyena
  cave hyena
  
• Cromileptes altivelis (Valenciennes, 1828) panther grouper
  panterbaars
  
• Crossarchus obscurus Cuvier, 1825 koesimanse
  common kusimanse
  
• Crossoptilon auritum (Pallas, 1811) blauwe oorfazant
  blue eared pheasant
  
• Crotalocephalus sp. Salter, 1853 trilobiet
  trilobite
  
• Crotalus adamanteus Palisot de Beauvois, 1799 diamantratelslang
  eastern diamondback rattlesnake
  
• Crotalus atrox Baird & Girard, 1853 Texaanse ratelslang
  western diamondback rattlesnake
  
• Crotalus viridis Rafinesque, 1818 prairieratelslang
  prairie rattlesnake
  
• Ctenocella lyra Toeplitz, 1919
• Ctenosaura similis (Gray, 1831) witzwarte grondleguaan
  black spiny-tailed iguana
  
• Cuculus canorus Linnaeus, 1758 koekoek
  common cuckoo
  
• Cuniculus paca (Linnaeus, 1766) paca
  lowland paca
  
• Cyanerpes caeruleus (Linnaeus, 1758) purple honeycreeper
  purpersuikervogel
  
• Cyanistes caeruleus (Linnaeus, 1758) pimpelmees
  Eurasian blue tit
  
• Cyanocorax sanblasianus (Lafresnaye, 1842) acapulcogaai
  San Blas jay
  
• Cyanocorax yncas (Boddaert, 1783) incagaai
  Inca jay
  
• Cyathus striatus (Huds.) Willd. gestreept nestzwammetje
  fluted bird's nest
  
• Cybele bellatula (Dalman 1827) trilobiet
  trilobite
  
• Cyclopterus lumpus Linnaeus, 1758 snotolf
  lumpsucker
  
• Cyclura cornuta (Bonnaterre, 1789) neushoornleguaan
  rhinoceros iguana
  
• Cyclura sp. ringstaartleguaan
  cyclura
  
• Cygnus buccinator Richardson, 1832 trompetzwaan
  trumpeter swan
  
• Cygnus columbianus (Ord, 1815) fluitzwaan
  tundra swan
  
• Cygnus columbianus bewickii Yarrell, 1830 kleine zwaan
  tundra swan