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- Oaxaca hummingbirdThe Oaxaca hummingbird or blue-capped hummingbird (Eupherusa cyanophrys) is an endangered
- Obama nungaraSpecies of flatworm
- ObeliaObelia is a genus of hydrozoans, a class of mainly marine and some freshwater animal speci
- ObirkoviaObirkovia is an extinct genus of pareiasaur from the late Permian Salarevo Formation of Ru
- Oceanic dispersalBiological dispersal across oceans
- Oceanic dolphinFamily of marine mammals
- Ocellated turkeySpecies of turkey native to (Yucatan Peninsula) Mexico, Guatemala, and Belize
- Ocellated wrasseThe ocellated wrasse (Symphodus ocellatus) is a species of wrasse native to the eastern At
- OcelotSpecies of wild cat
- Ochetellus glaberSpecies of ant
- OchodaeidaeOchodaeidae, also known as the sand-loving scarab beetles, is a small family of scarabaeif
- OctocoralliaClass of Anthozoa with 8-fold symmetry
- OctodonGenus of rodents
- OcypodeOcypode is a genus of ghost crabs found in the sandy shores of tropical and subtropical re
- OdobenidaeSeal family which includes the walrus
- OdobenocetopsExtinct genus of mammals
- Odontodactylus scyllarusOdontodactylus scyllarus, commonly known as the peacock mantis shrimp, harlequin mantis sh
- OdontotaeniusOdontotaenius is a genus of bess beetles in the family Passalidae. There are about 11 desc
- OdontotermesOdontotermes is a termite genus belonging to subfamily Macrotermitinae (fungus-growing ter
- Odontotermes formosanusSpecies of termite
- Odontotermes obesusSpecies of termite
- OecanthusOecanthus is a genus of cricket in subfamily Oecanthinae, the tree crickets.
- Oecanthus fultoniSpecies of cricket
- Oecophylla longinodaOecophylla longinoda (common name weaver ant) is a species of arboreal ant found in the fo
- Oecophylla smaragdinaSpecies of ant
- OedaleusOedaleus is a genus of grasshoppers in the family Acrididae.
- OedistomaOedistoma is a genus of longbill in the bird family Melanocharitidae (berrypeckers and lon
- OegopsidaOegopsida is one of the two orders of squid in the superorder Decapodiformes, in the class
- OenomysOenomys is a genus of African rodents. Known as rufous-nosed rats or rusty-nosed rats, the
- OilbirdSpecies of bird
- OkapiSpecies of mammal
- Okinawa flying foxThe Okinawa flying fox (Pteropus loochoensis) is a species of megabat in the genus Pteropu
- Old WorldLandmass corresponding to Afro–Eurasia
- Old World orioleFamily of birds
- Old World porcupineFamily of rodents
- Old World quailSeveral species of pheasant like birds
- Old World warblerGroup of birds
- Oleksandr MarkevychSoviet and Ukrainian zoologist
- OlfactoresClade of animals comprising vertebrates and tunicates
- Olfactory imprinting in sheepImprinting is most often used to describe an early-life bond that can later affect an anim
- OligochaetaSubclass of annelids including earthworms
- OligokyphusOligokyphus ("few cusps") is an extinct genus of herbivorous tritylodontid cynodont known
- OligotomidaeOligotomidae is a family of webspinners in the order Embioptera. There are about 6 genera
- OlinguitoSpecies of carnivores
- Olive baboonSpecies of Old World monkey
- Olive warblerSpecies of bird
- Olive-backed tailorbirdThe olive-backed tailorbird (Orthotomus sepium) is a species of passerine bird formerly pl
- Olive-crowned crescentchestThe olive-crowned crescentchest (Melanopareia maximiliani) is a species of bird in the fam
- Oliver Perry HayAmerican paleontologist
- OlmSpecies of amphibian
- OlympidytesOlympidytes is an extinct genus of Plotopteridae, a family of large, flightless marine bir
- OmeisaurusOmeisaurus (meaning "Omei lizard") is a genus of sauropod dinosaur from the Middle Jurassi
- OmethidaeOmethidae is a family of Elateroidea sometimes known as the false soldier beetles. They ar
- OmmaOmma is a genus of beetles in the family Ommatidae. Omma is an example of a living fossil.
- OmmatidaeFamily of beetles
- OmosaurusOmosaurus is a dubious genus of extinct crurotarsan reptile, possibly a phytosaur, from th
- OnagerSpecies of mammal
- OncorhynchusGenus of fishes
- OndatriniOndatrini is a tribe of semiaquatic rodents in the family Arvicolinae. They are known as m
- OniichthysOniichthys is an extinct genus of gar in the family Lepisosteidae. It contains a single sp
- OnychophoraPhylum of invertebrate animals
- OnychopodaOnychopoda are a specialised order of branchiopod crustaceans, belonging to the superorder
- Onymacris unguicularisSpecies of beetle
- OodiniTribe of beetles
- OoperipatellusOoperipatellus is a genus of Australian and New Zealand velvet worms in the Peripatopsidae
- OophagaOophaga is a genus of poison-dart frogs containing twelve species, many of which were form
- OothecaType of egg mass made by some molluscs, mantises and cockroaches
- OpabiniaExtinct stem-arthropod species found in Cambrian fossil deposits
- OpahGenus of fishes
- OphidiaGroup of squamate reptiles
- OphidiasteridaeThe Ophidiasteridae (Greek ophidia, Οφιδια, "of snakes", diminutive form) are a family of
- OphiophagyOphiophagy (Greek: ὄφις + φαγία, lit. 'snake eating') is a specialized form of feeding or
- OphiothrixGenus of brittle stars
- Ophiothrix fragilisSpecies of brittle star
- OphiotrichidaeOphiotrichidae are a family of brittle stars within the suborder Gnathophiurina.
- Ophiura ophiuraSpecies of brittle star
- OphthalmosaurusExtinct genus of reptiles
- OpilioacaridaeOpilioacaridae is the sole family of mites in the order Opilioacarida, made up of about 13
- OpilionesOrder of arachnids
- OpisthobranchiaOpisthobranchs () is a now informal name for a large and diverse group of specialized comp
- OpisthocomidaeFamily of birds
- OpisthoproctusOpisthoproctus soleatus is a species of fish in the family Opisthoproctidae. It was first
- Opisthoteuthis extensaOpisthoteuthis extensa is a species of octopus found off the west coast of Sumatra, an Ind
- Opisthoteuthis medusoidesOpisthoteuthis medusoides is a cirrate octopus living off the coast of Tanzania near Dar e
- Opportunistic breederEnvironmental mating strategy employed by various organisms
- Opposition to huntingOpposition to hunting is espoused by people or groups who object to the practice of huntin
- Orange-bellied flowerpeckerThe orange-bellied flowerpecker (Dicaeum trigonostigma) is a species of bird in the family
- Orange-breasted forest robinSpecies of bird
- Orange-headed thrushThe orange-headed thrush (Geokichla citrina) is a bird in the thrush family.
- Orb-weaver spiderFamily of spiders
- OrbiniidaOrder of annelid worms
- OrbiniidaeOrbiniidae is a family of polychaete worms. Orbiniids are mostly unselective deposit feede
- OrcinusGenus of oceanic mammals
- Orcinus meyeriOrcinus meyeri is a fossil species of Orcinus (killer whales) found in the Early Miocene d
- OreasteridaeThe Oreasteridae are a family of sea stars in the class Asteroidea.
- OreoicidaeFamily of birds
- Organic egg productionOrganic egg production is the production of eggs through organic means. In this process, t
- OribatidaOribatida (formerly Cryptostigmata), also known as oribatid mites, moss mites or beetle mi
- Oriental garden lizardSpecies of lizard
- Oriental giant squirrelGenus of rodents
- Oriental pied hornbillSpecies of bird
- Oriental rat fleaSpecies of flea
- Oriental ShorthairBreed of cat
- Oriente warblerThe Oriente warbler (Teretistris fornsi) is one of two species of bird in the Cuban warble
- Origin of birdsCentral question in evolutionary biology of birds
- Ornate monitorThe ornate monitor (Varanus niloticus ornatus) is a monitor lizard that is native to West
- OrnithocheirusGenus of ornithocheirid pterosaur from the Early Cretaceous
- OrnithodesmusOrnithodesmus (meaning "bird link") is a genus of small, dromaeosaurid dinosaur from the I
- OrnithomimosauriaExtinct clade of theropod dinosaurs
- OrnithomimusOrnithomimid dinosaur genus from the Late Cretaceous Period
- OrnithopodaClade of dinosaurs
- OrnithuraeClade of dinosaurs
- OrovenatorOrovenator is an extinct genus of diapsid from Lower Permian (Artinskian stage) deposits o
- OrrorinPostulated early hominin discovered in Kenya
- OrtacOrtac is a small uninhabited islet about 5 kilometres (3.1 miles) west of the coast of Ald
- OrthocerasExtinct genus of molluscs
- OrthoceridaOrthocerida, also known as the Michelinocerida, is an order of extinct orthoceratoid cepha
- OrthonectidaPhylum of marine invertebrate parasites
- OrthopestivirusGenus of viruses
- OrthopsGenus of true bugs
- OrtygornisOrtygornis is a genus of birds in the francolin group of the family Phasianidae.
- OrussoideaOrussoidea is a superfamily of sawflies. It contains the living family Orussidae, as well
- OryctesGenus of beetles
- OryctodromeusOryctodromeus (meaning "digging runner") was a genus of small orodromine thescelosaurid di
- OryxGenus of mammals (large antelopes)
- Osama bin Laden (elephant)Rogue bull elephant in India
- Oscarella lobularisOscarella lobularis is a species of sponge in the order Homosclerophorida. It is native to
- Oskar KuhnOskar Kuhn (7 March 1908, Munich – 1 May 1990) was a German palaeontologist.
- OsoriinaeThe Osoriinae are a subfamily of beetles in the family Staphylinidae, the rove beetles. Th
- OsteodermOsteoderms are bony deposits forming scales, plates, or other structures based in the derm
- OsteoglossiformesOrder of fishes
- OsteoglossomorphaOsteoglossomorpha is a group of bony fish in the Teleostei.
- Osteolaemus osborniOsteolaemus osborni, commonly known as Osborn's dwarf crocodile, is a species of crocodile
- OsteolepididaeOsteolepididae is a family of primitive, fish-like tetrapodomorphs (the clade that contain
- OsteolepiformesOsteolepiformes, also known as Osteolepidida, is a group of prehistoric lobe-finned fishes
- OsteolepisExtinct genus of lobe-finned fish
- OstraciidaeFamily of boxfishes
- OstrichGenus of largest living birds
- OtiorhynchusGenus of beetles
- OtitinaeOtitinae is the name of a subfamily of flies in the family Ulidiidae. It was formerly the
- OttoiaExtinct genus of priapulid worms
- OveroraptorOveroraptor (, meaning "piebald thief") is an extinct genus of paravian theropod of uncert
- OviparityReproduction via the laying of eggs
- OvipositorAnatomical structure for laying eggs
- OviraptorExtinct genus of dinosaurs
- OvisGenus of mammals
- OvoviviparityGestation type
- OwenodonOwenodon is a genus of iguanodontian dinosaur known from a partial lower jaw discovered in
- Owlet-nightjarGenus of birds
- OwlflyFamily of insects
- Oxfordian ageFirst age of the late Jurassic
- OxpeckerGenus of birds
- OxyaenidaeExtinct family of mammals
- OxycarenidaeOxycarenidae is a family of true bugs in the order Hemiptera. There are more than 20 gener
- Oxycarenus laetusSpecies of true bug
- OxyporinaeThe Oxyporinae are a subfamily of the Staphylinidae discovered in 1839 by Erichson. One ge
- OxytelinaeThe Oxytelinae are a subfamily of the Staphylinidae, rove beetles. There are about 20 gene
- Oyster reefThe term oyster reef refers to dense aggregations of oysters that form large colonial comm
- OystercatcherGenus of birds
- OzarkodinidaOzarkodinida is an extinct conodont order. It is part of the clade Prioniodontida, also kn
