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Look at the huge ocean. Miles and miles of water. We can't live without water. Nothing can live without water.

These animals live in the water. They couldn't survive unless there was a lot of water around them. They have clever ways of moving around and look very graceful.

The octopus is an amazing creature. It's got eight arms called tentacles that sway in the water looking for food. It scoots along the ocean floor, tentacles everywhere, its big round body going first and its big beady eyes on the lookout for danger.

Big flat fish called rays scoot along the ocean floor as well. The ray looks a bit like an underwater pancake, doesn't it? The ray's fins look like wings too.

These are jellyfish. They don't really look like fish, do they? And you couldn't eat them like jelly either. But I suppose you could say they do wobble a bit like jelly.

Look at this creature. It's a type of slug that lives in the sea. It's a wonderful colour. It's called a Spanish dancer. The Spanish dancer sways around in the water a bit like a dancing lady.

This big underwater creature has a large flat tail. It's called a sea cow. It lives in the sea and eats sea grass. But it doesn't look much like a cow, does it? Sea cows are great swimmers.

And this fish is a fabulous swimmer too. It's able to dart about quickly in the water. It's a blue marlin with a long pointy face, which looks as sharp as a pin. The marlin's shape helps it to swim fast. Look at it go!

Whatever the shape the animals are - big or small, round or flat, fins or flippers - they're all at home under water.