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There are lots of mammals in the world and to help you identify them, there are two important things to know.

The first thing is that all mammals have hair like sloths who love hanging upside down in trees.

Their hair grows up towards their head, so the rain runs off.

This beaver has thick fur to keep it warm as it pops in and out of the river.

Elephants don't need fur, because it's warm where they live.

They do have a few wiry hairs though.

And they are the biggest mammals on land.

They're not the tallest though, that's the giraffe.

These amazing mammals have long necks to help them eat the leaves at the top of the trees.

They have fine hair on their bodies and short tufty hair along their necks.

There are also mammals in the ocean.

Yes, whales are mammals, not fish, and like all mammals, they have hair.

Not much hair, just a few bristles, but it's still there.

Some mammals are small and live near you, like dogs and cats who have soft hair or fur.

And hamsters, hedgehogs, rats and even bats.

The second thing you need to know about mammals is that all mammal mothers produce milk for their young.

This cow has lots of milk for her calf.

These piglets are hungry for milk too.

Young gorillas, chimpanzees and orangutans also grow up strong and healthy, thanks to their mother's milk.

And so do marsupials, like kangaroos, wombats and koalas.

So now we know that all mammals have hair and as babies, they drink milk from their mother.

Just like humans.