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Reptiles come in many different shapes and sizes.

But all our wonderful.

They have tough scales to protect their body, especially useful if you're a snake, slithering over sharp rocks.

Britain's biggest reptile at almost two metres long is the grass snake.

It has a yellow stripe behind its head and can swim.

Although grass snakes are good swimmers.

The female lays her eggs on dry land.

Another snake that can be found in Britain is the adder.

Adders don't lay eggs, but instead have live young between five and twenty tiny stakes at a time.

In other countries you can find some dangerous reptiles.

Like this spitting cobra who looks like it has a hood over its head.

Then there are boa constrictors.

They use their strong muscles to squeeze other creatures until they can't breathe.

Boa constrictors will eat frogs, birds, lizards and even small deer or monkeys.

Watch out, it's an alligator, these reptiles hunt in the water and use their sharp teeth to bite their prey.

All turtles love to swim.

But this female turtle has come ashore to a sandy beach to lay her eggs.

When the tiny turtles hatch, they scramble through the sand and down to the sea, all by themselves.

There are lots of amazing lizards and they come in all shapes and sizes.

Lizards smell by licking the air with their tongues.

Some lizards, like this gecko, don't have any eyelids, so they also use their tongues to lick their eyes clean.

One lizard that can do something very special is the chameleon.

It is able to change the colour of its skin to match the leaves or stones around it.

This makes them hard to see as they are camouflaged.

Our world is full of reptiles, some small and shy, others big and fierce.

But all of them are amazing.