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Test yourself with our
Classification Game!




Images by Jasmine Chapgar

Reproduction (Baby animals!)

baby kittens and cat, mammalsAnother 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...

Babies growing in eggs

snake and her eggs

Reptiles usually lay eggs, and the babies then grow turtle eggsinside the egg until they are ready to come out.

Sometimes reptiles will give birth like mammals, without eggs.


birds lay 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!!

egg to tadpole to frog

The process amphibians go through is called "metamorphosis". Baby amphibian looks completely different than the adult amphibians!

fish lay many, many eggs

Fish also lay many many eggs - sometimes millions of tiny eggs! They are also laid in the water.


[Mammals and milk]
mammals = milkAnother important characteristic is that mammal babies drink milk from their mothers until they are old enough to eat other food.
humans are mammals too


You may have seen this with mammals and their babies - including humans,
who are also mammals!

warm blooded and cold blooded
appearance of mammals, reptiles, amphibians, birds and fish
main animal classification page