Animals

Simian

Simian (Simiiformes): the higher primates — monkeys, apes and humans

Sinoceratops

Sinoceratops — a large centrosaurine ceratopsid from China

Sinodelphys

Sinodelphys — an Early Cretaceous metatherian from China

Sinornithoides

Sinornithosaurus

Sinosauropteryx

Sinosauropteryx: Early Cretaceous feathered non-avian theropod

Sinosaurus

Sinosaurus (Early Jurassic theropod)

Sinovenator

Siphonophore

Siphonops leucoderus

Sir David's long-beaked echidna

Sirenia

Sirenia (order of aquatic mammals)

Sirenidae

Sirenidae — the sirens: aquatic, paedomorphic salamanders

Skate (fish)

Skink

Skink (Scincidae): biology, behavior, and natural history

Skipjack tuna

Skipjack tuna (Katsuwonus pelamis)

Skipper (butterfly)

Skua

Skua (Stercorarius): aggressive seabirds and kleptoparasites

Skunk

Skye terrier

Skye Terrier: history, characteristics, care, and notable examples

Sled dog

Slender loris

Slender salamander

Slender salamander (genus Batrachoseps)

Sloth

Sloth: slow-moving arboreal mammals of the Americas

Sloths are slow-moving, tree-dwelling mammals of the superorder Xenarthra found in Central and South America. They are notable for specialized claws, low metabolism, unique fur eco

Sloth bear

Slow loris

Slug

Small white

Small white (Pieris rapae)

Small-eared dormouse

Smalleye hammerhead

Smalleye hammerhead (Sphyrna tudes)

Smallmouth bass

Smilodon

Smilodon — the saber-toothed cat of the Pleistocene

Smooth snake

Smooth snake (Coronella austriaca)

Snail

Snail (gastropod): biology, diversity and human uses

Snail kite

Snail kite (Rostrhamus sociabilis): a specialist wetland raptor

Snake

Snares penguin

Snares penguin (Eudyptes robustus)

Snoopy

Snoopy — The Peanuts Beagle and Cultural Icon

Snow leopard

Snow leopard (Panthera uncia): description, habitat, and conservation

Snowy owl

Snowy owl (Bubo scandiacus)

Socorro dove

Socorro dove (Zenaida graysoni) — island species extinct in the wild

Sole (fish)

Sole (flatfish)

Solenodon

Solenodon — the slotted-tooth mammals

Solifugae

Solifugae (camel spiders, wind scorpions, sun spiders)

Somniosidae

Somniosidae — the sleeper sharks

Song thrush

Songbird

Songbird (Passeri): the singing suborder of passerine birds

Sooglossidae

Sooglossidae (Seychelles frogs): overview, biology and conservation