Reptiles:

Reptiles is the group that lay eggs ( EXCEPT SOME ) , They are also covered with scales and they are cold blooded animals , so they must live in cold places.

Examples : Snakes , Turtles , Comodo dragon , Lizards

More information:

Crocodile is not 100% reptile

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Amphibians:

Amphibians is the group that also lay eggs (EXCEPT SOME) and it is covered with scales and they also cold blooded meaning It mist live in cold place.

Examples : Frogs , Salamander

More information:

Crocodile doesn't have the abilty of amphibians to breath underwater

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Fish:

I mean with the word "fish" some of the water creatures that lay eggs (EXCEPT SOME) that is covered with scales and cold blooded meaning they must live in cold places like : Fish , Shark ,

More information: some fish catch it's preys by sound 

------------------------------------------------------------------------------------------------------------Birds: 

Birds is a group that lay eggs and it is covered with feathers and they are warm blooded meaning it must live i warm places like us

Examples: Eagle , Falcon , Parrot , Dodo

More information: Bat isn't a bird