ocean leatherjacket (English)
ocean perch (English)
okkernoot (Nederlands)
olifantachtigen (Nederlands)
onager (Nederlands)
onager (English)
oncilla (Nederlands)
onechte roos van Jericho (Nederlands)
ooievaarsbek van Madeira (English)
Oostafrikaanse driehoornkameleon (Nederlands)
opah (English)
opossums (Nederlands)
oriental civet (English)
oak aphid (English)
obsidiaan (Nederlands)
obsidian (English)
ocean quahog (English)
ocean sunfish (English)
ocellaris clownfish (English)
ocellated box crab (English)
ochre (English)
octopus (Nederlands)
oehoe (Nederlands)
oerrund (Nederlands)
oeveraaskever (Nederlands)
oeverloper (Nederlands)
oil beetle (English)
okapi (Nederlands)
okapi (English)
okeniet (Nederlands)
okenite (English)
oker (Nederlands)
old world babblers (English)
old world flycatchers (English)
oliekever (Nederlands)
olifantspoot (Nederlands)
olifantsvogel (Nederlands)
Olifantsvogels (Nederlands)
olijfboszangervink (Nederlands)
olive snail (English)
olive-backed tailorbird (English)
olivijn (Nederlands)
ombervis (Nederlands)
oncilla (English)
onechte gaviaal (Nederlands)
oogvlekkoraalvlinder (Nederlands)
ooievaar (Nederlands)
Ooievaarachtigen (Nederlands)
oorworm (Nederlands)
oostelijke kraagtrap (Nederlands)
oostelijke moa (Nederlands)
oostelijke smaragdhagedis (Nederlands)
oostelijke zwarte weduwe (Nederlands)
opaal (Nederlands)
opal (English)
opossums (English)
orang-oetans (Nederlands)
orange-breasted green pigeon (English)
orangutans (English)
oranje aaskever (Nederlands)
oranje rotshaan (Nederlands)
oranje troepiaal (Nederlands)
oranje wever (Nederlands)
oranjeborstpapegaaiduif (Nederlands)
orchid (English)
orchideeën (Nederlands)
organ pipe coral (English)
orgelpijpkoraal (Nederlands)
orka (Nederlands)
orleaanboom (Nederlands)
ornate tinamou (English)
orthoclase (English)
orthoklaas (Nederlands)
orthopterans (English)
osprey (English)
ostrich (English)
owlet moths (English)
ox-eye daisy (English)