Fishes

Fishes are cold blooded animals which breathe through gills and have the simplest skeleton among vertebrates.
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Reptiles

Most of reptiles are carnivorous; they are oviparous though some reptiles like the snake are ovoviviparous.
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Birds

Birds have their body covered with feathers and wings as anterior extremities, they breathe through lungs.
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Mammals

Most of mammals have four legs as extremities which allow them to move from one place to another.
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List of Animals that start with S

Saint Bernard

Balanced food

Salamander

Carnivore

Sand Lizard

Carnivore

Saola

Herbivore

Scorpion

Carnivore

Scorpion Fish

Omnivore

Sea Dragon

Carnivore

Sea Lion

Omnivore

Sea Otter

Omnivore

Sea Slug

Herbivore

Sea Squirt

Bacteria and plankton

Sea Turtle

Omnivore

Sea Urchin

Seaweeds

Seahorse

Omnivore

Seal

Carnivore

Serval

Carnivore

Sheep

Herbivore

Shih Tzu

Balanced food

Shrimp

Omnivore

Siamese

Protein and balanced fatty acids

Siberian

Protein and balanced fatty acids

Siberian Husky

Balanced food

Siberian Tiger

Carnivore

Silver Dollar

Omnivore

Skunk

Omnivore

Sloth

Omnivore

Slow Worm

Carnivore

Snail

Herbivore

Snake

Carnivore

Snapping Turtle

Omnivore

Snowshoe

Protein and balanced fatty acids

Snowy Owl

Omnivore

Somali

Protein and balanced fatty acids

South China Tiger

Carnivore

Spadefoot Toad

Omnivore

Sparrow

Omnivore

Spectacled Bear

Omnivore

Sperm Whale

Carnivore

Spider Monkey

Omnivore

Spiny Dogfish

Carnivore

Sponge

Bacteria and small organic particles

Squid

Carnivore

Squirrel

Omnivore

Squirrel Monkey

Omnivore

Stag Beetle

Omnivore

Starfish

Omnivore

Stellers Sea Cow

Herbivore

Stick Insect

Herbivore

Stingray

Carnivore

Stoat

Carnivore

Sumatran Elephant

Herbivore

Sumatran Tiger

Carnivore

Sun Bear

Omnivore

Swan

Omnivore