Another difference is the way animals give birth to their young (babies).
Most baby mammals grow inside their mother until they are born. This is something that makes mammals different, because most other kinds of animals do something else...
Reptiles usually lay eggs, and the babies then grow 
inside the egg until they are ready to come out.
Sometimes reptiles will give birth like mammals, without eggs.
inside the egg until they are ready to come out.Sometimes reptiles will give birth like mammals, without eggs.
Birds also lay eggs, with a very hard outer shell. Birds generally lay 1 to 17 eggs at a time
Amphibians lay thousands and sometimes millions of small, soft eggs, and they lay them in the water! The eggs are jelly-like.
Amphibian means "double life"... the early part of an amphibian's life is spent in the water, and usually as they get older then they also spend time on land. Think of a tadpole turning into a frog!!
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The process amphibians go through is called "metamorphosis". Baby amphibian looks completely different than the adult amphibians!
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Fish also lay many many eggs - sometimes millions of tiny eggs! They are also laid in the water.
