Common Name - -	Family : Order
Oak ambrosia beetle - -	Platypodidae : Coleoptera
Oak bark beetle - -	Scolytidae : Coleoptera
Oak bark beetle - -	Scolytidae : Coleoptera
Oak carpenter ant - -	Formicidae : Hymenoptera
Oak clearwing borer - -	Sesiidae : Lepidoptera
Oak clearwing moth - -	Sesiidae : Lepidoptera
Oak gall borer - -	Sesiidae : Lepidoptera
Oak leaffolder - -	Tortricidae : Lepidoptera
Oak leafmining moth - -	Tischeriidae : Lepidoptera
Oak leafroller - -	Tortricidae : Lepidoptera
Oak leaftier - -	Tortricidae : Lepidoptera
Oak long-horned flat-body - -	Oecophoridae : Lepidoptera
Oak mining-bee - -	Andrenidae : Hymenoptera
Oak olethreutid leafroller - -	Tortricidae : Lepidoptera
Oak pinhole borer - -	Platypodidae : Coleoptera
Oak processionary moth - -	Thaumetopoeidae : Lepidoptera
Oak red-barred twist - -	Tortricidae : Lepidoptera
Oak twig borer - -	Cerambycidae : Coleoptera
Oak twig pruner - -	Cerambycidae : Coleoptera
Oak wood ambrosia beetle - -	Scolytidae : Coleoptera
Oak zebra beetle - -	Cerambycidae : Coleoptera
Oakmos lichen - -	Parmeliaceae : Lecanorales
Oarweed - -	Laminariaceae : Laminariales
Obliquebanded leafroller - -	Tortricidae : Lepidoptera
Obscure birch piercer moth - -	Tortricidae : Lepidoptera
Obscure mealybug - -	Pseudococcidae : Homoptera
Obscure puffer - -	Tetraodontidae : Tetraodontiformes
Obsolete chromodoris - -	Chromodorididae : Nudibranchia
Obtuse sawyer - -	Cerambycidae : Coleoptera
Ocean beach tiger beetle - -	Cicindelidae : Coleoptera
Ocean perch - -	Sebastidae : Perciformes
Oceanic puffer - -	Tetraodontidae : Tetraodontiformes
Ocellate phyllidia - -	Phyllidiidae : Nudibranchia
Ocellated pufferfish - -	Tetraodontidae : Tetraodontiformes
Ocellated treefrog - -	Hylidae : Anura
Ocelot - -	Felidae : Carnivora
Ochre sea star - -	Asteriidae : Forcipulatida
October thorn - -	Geometridae : Lepidoptera
Odd beetle - -	Tenebrionidae : Coleoptera
Odorous house ant - -	Formicidae : Hymenoptera
Oil palm bunch moth - -	Pyralidae : Lepidoptera
Okinawan marine sponge - -	Agelasiidae : Agelasida
Okinawan marine sponge - -	Jaspidae : Tetractinellida
Okinawan marine sponge - -	Petrosiidae : Haplosclerida
Okinawan marine tunicate - -	Polycitoridae : Aplousobranchia
Okinawan sponge - -	Suberitidae : Suberitida
Okra leafworm - -	Noctuidae : Lepidoptera
Old house borer - -	Cerambycidae : Coleoptera
Old man dart moth - -	Noctuidae : Lepidoptera
Old man's beard - -	Usneaceae : Lecanorales
Old World stingless bee - -	Apidae : Hymenoptera
Oleander scale - -	Diaspididae : Homoptera
Olive bark beetle - -	Scolytidae : Coleoptera
Olive fruit fly - -	Tephritidae : Diptera
Olive moth - -	Noctuidae : Lepidoptera
Olive moth - -	Yponomeutidae : Lepidoptera
Olive pyralid moth - -	Pyralidae : Lepidoptera
Omitted cucullia moth - -	Noctuidae : Lepidoptera
Omnivorous leafroller - -	Tortricidae : Lepidoptera
Omnivorous leaftier - -	Tortricidae : Lepidoptera
Omnivorous looper - -	Geometridae : Lepidoptera
Onion fly - -	Anthomyiidae : Diptera
Onion thrips - -	Thripidae : Thysanoptera
Orache moth - -	Noctuidae : Lepidoptera
Orange crater sponge - -	Agelasiidae : Agelasida
Orange cushion star - -	Pterasteriidae : Velatida
Orange dog - -	Papilionidae : Lepidoptera
Orange elephant ear sponge - -	Agelasiidae : Agelasida
Orange encrusted turret sponge - -	Chalinidae : Haplosclerida
Orange fan sponge - -	Scopalinidae : Scopalinida
Orange ladybird - -	Coccinellidae : Coleoptera
Orange lattice ascidian - -	Didemnidae : Aplousobranchia
Orange lichen - -	Caloplacacoae : Teloschistales
Orange puffball sponge - -	Ancorinidae : Tetractinellida
Orange puffball sponge - -	Tethyidae : Tethyida
Orange rim lichen - -	Lecanoraceae : Lecanorales
Orange roughy - -	Trachichthyidae : Trachichthyiformes
Orange sea sheath - -	Pseudodistomidae : Aplousobranchia
Orange sea squirt - -	Styelidae : Stolidobranchia
Orange spiny sponge - -	Dictyonellidae : Bubarida
Orange tortrix - -	Tortricidae : Lepidoptera
Orange wall lichen - -	Teloschistaceae : Teloschistales
Orange wheat blossom midge - -	Cecidomyiidae : Diptera
Orange-bellied newt - -	Salamandridae : Caudata
Orange-brown longhorn beetle - -	Cerambycidae : Coleoptera
Orange-clubbed nudibranch - -	Polyceridae : Nudibranchia
Orange-crowned toadlet - -	Myobatrachidae : Anura
Orangefin labeo - -	Cyprinidae : Cypriniformes
Orange-footed sea cucumber - -	Cucumariidae : Dendrochirotida
Orange-legged furrow bee - -	Halictidae : Hymenoptera
Orangered boring sponge - -	Spirastrellidae : Clionaida
Orange-spot piercer moth - -	Tortricidae : Lepidoptera
Orange-spotted rabbitfish - -	Siganidae : Perciformes
Orange-spotted toadfish - -	Tetraodontidae : Tetraodontiformes
Orange-spotted toadfish - -	Tetraodontidae : Tetraodontiformes
Orange-spotted toadfish - -	Tetraodontidae : Tetraodontiformes
Orange-tailed clearwing - -	Sesiidae : Lepidoptera
Orange-tailed mining-bee - -	Andrenidae : Hymenoptera
Orchard ermine - -	Yponomeutidae : Lepidoptera
Orchard swallowtail - -	Papilionidae : Lepidoptera
Orchid dupe wasp - -	Ichneumonidae : Hymenoptera
Organ pipe mud dauber - -	Crabronidae : Hymenoptera
Organ-pipe coral - -	Tubiporidae : Alcyonacea
Oribi - -	Bovidae : Artiodactyla
Oriental beetle - -	Scarabaeidae : Coleoptera
Oriental beetle grub - -	Scarabaeidae : Coleoptera
Oriental cockroach - -	Blattidae : Dictyoptera
Oriental fruit fly - -	Tephritidae : Diptera
Oriental hornet - -	Vespidae : Hymenoptera
Oriental migratory locust - -	Acrididae : Orthoptera
Oriental peach moth - -	Tortricidae : Lepidoptera
Oriental spruce engraver - -	Scolytidae : Coleoptera
Oriental tea tortrix moth - -	Tortricidae : Lepidoptera
Oriental tiger moth - -	Erebidae : Lepidoptera
Oriental tobacco budworm - -	Noctuidae : Lepidoptera
Oriental tussock moth - -	Lymantriidae : Lepidoptera
Ornate burrowing frog - -	Myobatrachidae : Anura
Ornate emperor - -	Lethridae : Perciformes
Ornate jobfish - -	Lutjanidae : Perciformes
Ornate leaf slug - -	Elysiidae : Sacoglossa
Ornate tree iguana - -	Iguanidae : Squamata
Osaka beetle - -	Scarabaeidae : Coleoptera
Oval sea grapes seaweed - -	Caulerpaceae : Bryopsidales
Ovate comb jelly - -	Beroidae : Beroida
Ox beetle - -	Scarabaeidae : Coleoptera
Oyster thief - -	Scytosiphonaceae : Scytosiphonales
Ozark checkerspot - -	Nymphalidae : Lepidoptera