Animals

Ruminant

Ruminant: cud‑chewing herbivores with specialized stomachs

Ruminantia

Ruminantia — the ruminant mammals

Rüppell's fox

Rüppell's fox (Vulpes rueppelli) — desert fox of North Africa and the Middle East

Rusty-spotted cat

Rusty-spotted cat (Prionailurus rubiginosus)

Rutiodon

Rutiodon — a Late Triassic phytosaur

Saber–toothed cat

Sable

Sable (Martes zibellina): forest marten and source of prized fur

Sacred kingfisher

Saddleback toad

Saddleback toad (Brachycephalus) — tiny cloud-forest frogs

Saffron cod

Saint Helena plover

Saint Helena plover (Wirebird)

Saint Vincent amazon

Saint Vincent amazon (Amazona guildingii)

Salamander

Salamander (order Caudata/Urodela)

Salamandridae

Salamandridae — true salamanders and newts

Salamandroidea

Salamandroidea (advanced salamanders): overview and significance

Salmon

Salmon (Salmonidae): biology, life cycle, uses and conservation

Salmonidae

Salmonidae — family of salmon, trout, chars, graylings and whitefishes

Salp

Salp — a barrel-shaped, free-swimming tunicate of the open ocean

Saltasaurus

Saltasaurus — armored titanosaur of the Late Cretaceous

Saltopus

Saltopus — small Late Triassic reptile (Saltopus elginensis)

Saltwater crocodile

Saltwater crocodile (Crocodylus porosus)

Samoyed (dog)

Sand cat

Sand cat (Felis margarita)

Sand dollar

Sand dollar: flattened burrowing echinoids and their ecology

Sandfly

Sandfly (Phlebotomine flies): biology, medical importance, and prevention

Sandhill crane

Sandhill crane (Grus canadensis)

Sandpiper

Sandpiper (Scolopacidae): shorebirds that probe mudflats and coasts

Sandworm

Sandworm: marine worms, bait species, and the fictional desert nemesis

Santa Catalina rattlesnake

Santa's Little Helper

Santa's Little Helper — The Simpsons' family greyhound

Sapito Rugoso Del Marahuaka

Sapito Rugoso del Marahuaka (Metaphryniscus sosae)

Sarcopterygii

Sarcopterygii (lobe‑finned fishes)

Sarcosaurus

Sarcosaurus: an Early Jurassic basal theropod

Sarcosuchus

Sarcosuchus — the giant Cretaceous crocodyliform

Sardine

Sardine (pilchard): small oily fish of the herring family

Šarplaninac

Šarplaninac (Sharplaninec) — Balkan Shepherd and Livestock Guardian Dog

Sarus crane

Sarus crane (Antigone antigone)

Saurischia

Saurolophus

Saurolophus: duck‑billed dinosaur with a distinctive forehead crest

Sauropelta

Saurophaganax

Saurophaganax — a large allosaurid predator of the Late Jurassic

Sauropod

Sauropodomorph

Sauropodomorpha: the long-necked herbivorous dinosaurs

Sauroposeidon

Sauropterygia

Saurornithoides

Savannah cat

Savannah monitor

Savannah monitor (Varanus exanthematicus)