Mammal - They have fur/hair: examples are rats, dogs, deer, monkeys, bats, whales, and humans, Fish  - They have scales: examples are tuna, cod and tuna, shark, etc., Birds - They have feathers: examples are dove, sparrow, owl, eagle, hen, parrot, etc., Amphibians - They have thin, moist skin: examples are frog, toad, salamanders, newts, etc., Reptiles - They have dry scales: examples are snakes, lizards, turtles, crocodiles, etc,

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