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- Saccharomyces cerevisiaeSpecies of yeast
- SaccharomycotinaSubdivision of fungi
- SaffronSpice made from crocus flowers
- SafranalSafranal is an organic compound isolated from saffron, the spice consisting of the stigmas
- SalamanderOrder of amphibians
- SalmoGenus of fishes
- SalmonCommercially important migratory fish
- Salmon runAnnual migration of salmon
- SalmonellaGenus of bacteria
- SalmonidaeFamily of ray-finned fishes
- SalvelinusGenus of fishes
- SalviaLargest genus of plants in the mint family
- SandpiperFamily of birds
- Sandro PignattiAlessandro "Sandro" Pignatti (born 28 September 1930) is an Italian botanist specialising
- SarcophagaSarcophaga is a genus of true flies and the type genus of the flesh-fly family (Sarcophagi
- SarcopterygiiClade of lobe-finned fish
- SarcoramphusSarcoramphus is a genus of New World vulture that contains a single extant species, the ki
- Sarcoscypha coccineaSpecies of fungus
- SardineCommon name for various small, oily forage fish
- SasseniaSassenia is an extinct genus of prehistoric coelacanth lobe-finned fish that lived during
- SauerkrautFinely sliced and fermented cabbage
- SauropodaExtinct clade of saurischian dinosaurs
- SavegreSavegre is a district of the Quepos canton, in the Puntarenas province of Costa Rica.
- SawfishFamily of fishes
- Scale insectSuperfamily of insects
- ScallopFamily of shellfish, many edible
- ScapteriscusScapteriscus is a genus of insects in the family Gryllotalpidae, the mole crickets. Member
- SciadopityaceaeSciadopityaceae, commonly called umbrella pines, is a family of conifers now endemic to Ja
- ScincomorphaInfraorder of lizards
- SciurinaeSubfamily of rodents
- SciuromorphaSuborder of mammals
- ScorpaeniformesObsolete order of ray-finned fishes
- ScorpionPredatory order of arachnids
- Scrub hareThe scrub hare (Lepus saxatilis) is one of two species of hares found in southern Namibia,
- Scutellaria baicalensisScutellaria baicalensis, with the common name Baikal skullcap or Chinese skullcap, is a sp
- Sea beetSubspecies of beet (terrestrial)
- Sea cucumberClass of echinoderms
- Sea otterSpecies of marine mammal
- Sea salt aerosolSea salt aerosol, which originally comes from sea spray, is one of the most widely distrib
- Sea spraySea water particles that are formed directly from the ocean
- Sea turtleReptiles of the superfamily Chelonioidea
- Sea urchinClass of marine invertebrates
- SeabirdBirds living in the maritime environment
- SeahorseGenus of bony fishes
- SeaweedMacroscopic marine algae
- SecaleSecale is a genus of the grass tribe Triticeae, which is related to barley (Hordeum) and w
- SecretarybirdBird of prey
- Seedless fruitType of fruit
- Segmentation (biology)Division of some animal and plant body plans into a series of segments
- SelenideraSelenidera is a bird genus containing six species of dichromatic toucanets in the toucan f
- SequoioideaeSubfamily of coniferous trees (redwoods)
- SerranidaeFamily of fishes
- SesamePlant cultivated for its edible seeds
- SesamumSesamum is a genus of about 20 species in the flowering plant family Pedaliaceae. The plan
- Sesamum radiatumSesamum radiatum is a species of flowering plant in the Pedaliaceae. It is in the same gen
- SetaphytaThe Setaphyta are a clade within the Bryophyta which includes Marchantiophytina (liverwort
- SharkPredatory cartilaginous fishes
- Shark catfishThe shark catfishes form the family Pangasiidae. They are found in fresh and brackish wate
- Shark finningIllegal harvesting of fins from live sharks
- SheepSpecies of domesticated mammal
- ShiitakeSpecies of edible mushroom
- ShoebillSpecies of bird
- Show hunterThe Hunter division is a branch of horse show competition that is judged on the horse's pe
- Show jumpingCompetitive equestrian sport
- ShrewFamily of mammals
- ShrikeFamily of birds
- ShrimpDecapod crustaceans
- ShungaJapanese erotic art
- Siamese catBreed of domestic cat
- Siamese fighting fishSpecies of fish native to Southeast Asia
- Sida (plant)Sida is a genus of flowering plants in the mallow family, Malvaceae. They are distributed
- SidewindingParticular kind of snake locomotion
- SiluridaeSiluridae is the nominate family of catfishes in the order Siluriformes. About 105 living
- SilurolepisSilurolepis platydorsalis is a species of Silurian-aged "maxillate" early placoderm that h
- SilybumSilybum (milk thistle) is a genus of two species of thistles in the family Asteraceae. The
- SiphonopidaeThe Siphonopidae are the family of common caecilians. They are found in Central and South
- SireniaOrder of aquatic herbivorous mammals
- SisoridaeSisoridae is a family of catfishes. These Asian catfishes live in fast-moving waters and o
- SistrurusSistrurus is a genus of pit vipers in the subfamily Crotalinae of the family Viperidae. Th
- Skate (fish)Family of fishes
- SkinkFamily of reptiles
- SkunkCommon name of mammals
- Slender suckerfishThe slender suckerfish or lousefish (Phtheirichthys lineatus) is a rare species of remora
- Slime moldSpore-forming organisms
- SlothGroup of tree dwelling mammals noted for slowness
- Slow lorisGenus of primates from Southeast Asia
- Smelt (fish)Family of fishes
- Smith's bush squirrelSmith's bush squirrel (Paraxerus cepapi), also known as the yellow-footed squirrel or tree
- SnakeLimbless, scaly, elongate reptile
- Snow leopardSpecies of large felid
- Soft plastic baitSoft plastic bait, commonly known as soft lure, soft plastics, plastic bait, worm lure or
- SolanaceaeFamily of flowering plants
- SolidagoGenus of flowering plants
- Solidago virgaureaSolidago virgaurea, the European goldenrod or woundwort, is an herbaceous perennial plant
- Somali ostrichSpecies of flightless bird
- SonchusGenus of flowering plants in the daisy family
- SongbirdSuborder of birds
- Sorbus decoraSorbus decora, commonly known as the northern mountain ash, showy mountain-ash, Greenland
- SorghumSpecies of grain
- Southern blue whitingThe southern blue whiting (Micromesistius australis) is a codfish of the genus Micromesist
- Southern bluefin tunaSpecies of fish
- Southern painted turtleThe southern painted turtle (Chrysemys dorsalis) is a species of turtle in the family Emyd
- SoybeanLegume grown for its edible bean
- Spanish mossSpecies of plant, ''Tillandsia usneoides''
- SpatangoidaThe heart urchins or Spatangoida are an order of sea urchins.
- Spathiphyllum cochlearispathumSpathiphyllum cochlearispathum is a plant species in the family Araceae. It is native to s
- SpawningEggs and sperm released into water
- Species diversityNumber of distinct species in a biological community
- Speckled pigeonThe speckled pigeon (Columba guinea), also African rock pigeon or Guinea pigeon, is a pige
- Sperm whaleLargest species of toothed whale
- SphaerocarpalesSphaerocarpales is an order of plants within the liverworts. Approximately twenty species
- SphaerodactylidaeThe Sphaerodactylidae are a family of geckos (Gekkota) distributed in North America, Centr
- Sphaerodactylus ariasaeSpecies of reptile
- SphagnumGenus of mosses, peat moss
- SphenobaieraSphenobaiera is a form genus for plant leaves belonging to the order Ginkgoales found in r
- SphenodontidaeSphenodontidae is a family within the reptile group Rhynchocephalia, comprising taxa most
- SpiderOrder of arachnids
- Spider monkeyGenus of mammals belonging to the New World monkeys
- SpinachSpecies of flowering plant
- SpinaciaSpinacia is a flowering plant genus in the subfamily Chenopodioideae of the family Amarant
- Spiracle (vertebrates)Spiracles () are openings on the surface of some animals, which usually lead to respirator
- SpiraeaSpiraea , sometimes spelled spirea in common names, and commonly known as meadowsweets or
- SpirillinidaThe Spirillinida are an order of foraminifera in which the test, or shell, primitively con
- SpitzDog type
- SpongeAnimals of the phylum Porifera
- Spotted jellyThe spotted jelly (Mastigias papua), lagoon jelly, golden medusa, or Papuan jellyfish, is
- SpratCommon name for several kinds of forage fish
- SpringtailClass of arthropods
- SpruceGenus of coniferous evergreen trees
- SqualiformesOrder of fishes
- SquatiniformesSquatiniformes is an order of sharks belonging to Squalomorphii. It contains only a single
- SquidSuperorder of cephalopod molluscs
- SquirrelFamily of rodents
- Standard weight in fishStandard weight in fish is the typical or expected weight at a given total length for a sp
- StangerochampsaStangerochampsa is an extinct genus of alligatorid, possibly an alligatorine or a stem-cai
- Staphylococcus aureusSpecies of Gram-positive bacterium
- Staple foodMajor portion of a standard diet
- StarfishClass of echinoderms, marine animal
- StarlingFamily of birds
- StegosaurusGenus of Late Jurassic armored dinosaur
- StenianLast period of the Mesoproterozoic Era
- StenotritidaeThe Stenotritidae is the smallest of all formally recognised bee families, with only 21 sp
- StensioellaStensioella heintzi is an enigmatic placoderm of arcane affinity. It is only known from th
- SterculiaSterculia is a genus of flowering plants in the mallow family, Malvaceae: subfamily Stercu
- SteropodontidaeSteropodontidae is an extinct family of early monotreme mammals known from the Cretaceous
- SticholoncheSticholonche is a genus of radiolarians with a single species, Sticholonche zanclea, found
- SticklebackFamily of ray-finned fish
- StingraySuborder of fishes
- StoatSpecies of mammal
- StolotermitidaeStolotermitidae is a family of termites in the order Blattodea, with two extant genera for
- StorkType of wading bird
- StramenopileClade of eukaryotes
- StranglingCompression of the neck that may lead to unconsciousness or death
- Strangulation in domestic violenceStrangulation in the context of domestic violence is a potentially lethal form of assault.
- StrawberryEdible fruit
- StrepsirrhiniSuborder of primates
- StreptophytaClade consisting of the charophyte algae and land plants
- StromatoporoideaExtinct clade of reef-building sponges
- SturgeonRay-finned fish
- StygotantulusStygotantulus is a genus of crustacean with the sole species Stygotantulus stocki. It live
- StylotermitidaeStylotermitidae is a family of termites in the order Blattodea. There are two extinct and
- StyriofelisStyriofelis is an extinct genus of Felidae known from the Miocene of Europe.
- Sugar beetPlant grown commercially for sugar production
- Sugar industryEnterprises dealing with sugar
- SugarcaneSeveral species of grass used for sugar production
- SuinaSuborder of mammals
- Sulawesi bear cuscusThe Sulawesi bear cuscus, also known as the Sulawesi bear phalanger (Ailurops ursinus), is
- SulidaeFamily of birds
- SunbirdFamily of birds
- SusumanioideaSusumanioidea is an extinct superfamily of Phasmatodea, known from the Middle Jurassic to
- SwallowFamily of songbirds
- Swallowtail butterflyButterflies of family Papilionidae
- SwanTribe of large water birds
- Sweet potatoSpecies of edible plant
- Swietenia humilisSpecies of tree
- Swietenia macrophyllaSpecies of plant
- Swift (bird)Family of birds
- SwordfishFish which has a long, pointed bill
- Symbiosis in AmoebozoaAmoebozoa of the free living genus Acanthamoeba and the social amoeba genus Dictyostelium
- SynapsidaClade of tetrapods
- SynechocystisSynechocystis is a genus of unicellular, freshwater cyanobacteria in the family Merismoped
- Syringa vulgarisSyringa vulgaris, the lilac or common lilac, is a species of flowering plant in the olive
- Syrphus ribesiiSyrphus ribesii is a very common Holarctic species of hoverfly. Its larvae feed on aphids.