• Callosciurus prevostii (Desmarest, 1822) Prevosts klapperrat
  Prevost's squirrel
  
• Calluna vulgaris (L.) Hull struikhei
  common heather
  
• Calyx nicaeensis (Risso, 1826) spons
  sponge
  
• Camarasaurus supremus Cope 1877 camarasaurus
  camarasaurus
  
• Camarhynchus parvulus (Gould, 1837) kleine boomvink
  small tree finch
  
• Camarhynchus psittacula Gould, 1837 grote boomvink
  large tree finch
  
• Camelus bactrianus Linnaeus, 1758 Bactrische kameel
  Bactrian camel
  
• Canadaspis sp. Novozhilov in Orlov (1960) primitieve geleedpotige
  primitive arthropod
  
• Cancellaria contorta
• Cancellaria contorta gelriana (A.W. Janssen, 1972)
• Cancer pagurus Linnaeus, 1758 noordzeekrab
  edible crab
  
• Canis aureus (Linnaeus, 1758) goudjakhals
  golden jackal
  
• Canis lupus familiaris Linnaeus, 1758 hond
  dog
  
• Canis lupus Linnaeus, 1758 wolf
  wolf
  
• Capra hircus Linnaeus, 1758 goat
  geit
  
• Capra ibex Linnaeus, 1758 alpensteenbok
  Alpine ibex
  
• Capreolus capreolus (Linnaeus, 1758) ree
  roe deer
  
• Carabus auronitens Fabricius, 1792 loopkever
  ground beetle
  
• Caracal caracal (Schreber, 1776) caracal
  caracal
  
• Caracara plancus (Miller, 1777) kuifcaracara
  southern crested caracara
  
• Carassius auratus (Linnaeus, 1758) goudvis
  goldfish
  
• Carassius auratus auratus (Linnaeus, 1758) goudvis
  goldfish
  
• Carausius morosus (Sinéty, 1901) Indische wandelende tak
  Indian stick insect
  
• Carcharodon carcharias (Linnaeus, 1758) witte haai
  great white shark
  
• Cardinalis cardinalis (Linnaeus, 1758) rode kardinaal
  northern cardinal
  
• Cardioptera squalodon Werner, 1932 bidsprinkhaan
  praying mantis
  
• Carduelis cannabina (Linnaeus, 1758) kneu
  common linnet
  
• Carduelis carduelis (Linnaeus, 1758) putter
  European goldfinch
  
• Carduelis flammea (Linnaeus, 1758) barmsijs
  common redpoll
  
• Carduelis spinus (Linnaeus, 1758) sijs
  Eurasian siskin
  
• Cariama cristata (Linnaeus, 1766) red-legged seriema
  kuifseriema
  
• Carnegiea gigantea (Engelm.) Britton & Rose saguarocactus
  saguaro
  
• carneool carneool
  carnelian
  
• Carpinus betulus L. haagbeuk
  
• Cassia fistula L. Indische gouden regen
  golden rain tree
  
• Cassis cornuta (Linnaeus, 1758) horned helmet
  gehoornde helmslak
  
• Cassis tuberosa (Linnaeus, 1758) king helmet
  koninklijke helmslak
  
• cassiteriet cassiteriet
  cassiterite
  
• Castanea sativa Mill. tamme kastanje
  sweet chestnut
  
• Castor fiber Linnaeus, 1758 bever
  Eurasian beaver
  
• Casuarius casuarius (Linnaeus, 1758) helmkasuaris
  southern cassowary
  
• Cathartes aura (Linnaeus, 1758) roodkopgier
  turkey vulture
  
• Caulerpa taxifolia (Vahl) C.Agardh Chlorophyta
  Chlorophyta
  
• Cavia porcellus (Linnaeus, 1758) cavia
  guinea pig
  
• Cedrus libani A.Rich. libanonceder
  cedar of Lebanon
  
• Ceiba pentandra (L.) Gaertn. kapok
  kapok
  
• celestien celestien
  celestine
  
• Centrocercus urophasianus (Bonaparte, 1827) waaierhoen
  greater sage grouse
  
• Centrochelys sulcata (Miller, 1779) sporenschildpad
  African spurred tortoise
  
• Cepaea nemoralis (Linnaeus, 1758) zwartgerande tuinslak
  brown-lipped snail