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 R

Rabbit

Herbivore

Raccoon

Omnivore

Raccoon Dog

Carnivore

Ragdoll

Protein and balanced fatty acids

Rat

Omnivore

Rattlesnake

Diet based on small animals

Red Knee Tarantula

Carnivore

Red Panda

Omnivore

Red Wolf

Carnivore

Reindeer

Herbivore

Rhinoceros

Herbivore

River Dolphin

Carnivore

River Turtle

Omnivore

Robin

Omnivore

Rock Hyrax

Omnivore

Rockhopper Penguin

Carnivore

Rottweiler

Balanced food

Royal Penguin

Carnivore

Russian Blue

Protein and balanced fatty acids