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Introduction

A mammal is a warm-blooded animal that has a backbone, gives birth to and feeds its young with milk. Just like us, we are mammals too.

Have you ever looked out to sea and wondered what plants and curious creatures may be lurking underneath the deep blue water and crashing waves? In Great Britain, there is a huge variety of marine life. Marine life are plants and animals that live in the sea.

Looking out to sea from the coast.

What lies beneath

Have you ever been lucky enough to spot some super cool creatures from the sea? Let’s meet some of the marine life that can be spotted around the British Isles.

Underwater photo of an octopus.

An octopus is identified by its eight long arms, rounded body and big bulging eyes. It is a part of the family. It is not a mammal. Octopuses have great taste in food and love to eat crabs, shrimps and lobsters. They skilfully crawl across the seabed and squeeze their arms into small openings, then use the suckers that line their arms to pull their prey into their mouths.

Blue shark

Underwater photo of a blue shark.

The blue shark likes to visit our seas in the summer months when the water is a little warmer for them. They are spectacular creatures with a sleek, metallic blue body, perfect for camouflage, and a long cone-shaped snout. They are very sneaky predators. They swim slowly to preserve their energy but as soon as they spot a small fish or squid, they have a burst of energy in order to capture their victims. Sharks are cold blooded and therefore are not mammals.

Jellyfish

Underwater photo of a jellyfish.

These amazing creatures come in many vibrant colours like pink, blue, purple and yellow. Did you know that jellyfish have no brain, heart, bones or eyes? Jellyfish are not mammals. They have tentacles that sting. This startles their prey and allows the jellyfish to eat them up in one big gulp. A jellyfish’s mouth is not only used to eat food such as crabs, fish and small plants but it can be used as a propeller. The jellyfish can squirt water from its mouth, and this enables them to move through the water.

Porpoise

A harbour porpoise stranded on a beach off the UK coast.

These beautiful creatures are very shy. Even though they grow quickly, they are much smaller than dolphins. They have a blunt head, triangular fins and very sharp teeth. Porpoises are mammals. Sadly, they are declining in number because they can be accidentally caught by fishermen.

Atlantic grey seal

Side profile of an atlantic grey seal.

The Atlantic grey seal is the largest species of seal to visit our shores. These seals are pretty easy to spot too, as they live in large groups and can often be seen lying on the beaches with their snowy white seal pups or bobbing in the waves. They are warm-blooded mammals that feed their young with milk.

Video: The life of the Atlantic grey seal

Learn all about seals, their habits and the fall and rise of the seal population over the years.

Hunting seals

Just over 100 years ago, the vicious Victorians used to hunt these magnificent mammals for their meat and kill the seal pups for their fluffy white coats. As a result, there were only 500 grey seals in the whole of the UK.

Safeguarding seals

Thankfully, in 1970 a new law was introduced making all of the seals in the waters around Wales, England and Scotland a protected species. This means that it is forbidden by law to harm, capture or kill them. Now, there are an estimated 120,000 grey seals on our shores.

Top tips - How to protect seals today

Image gallerySkip image gallerySlide 1 of 3, A seal resting on the beach., If you see a seal resting on the beach, it is probably digesting its food, so give them plenty of space and keep dogs well away from them.

Winter babies

A cute seal pup.

How cute is this seal pup? Its fluffy white coat keeps it warm and it is fed regularly by its mother, giving it lots of vital nutrients.

Did you know?

After only a few weeks the cute seal pup loses its fluffy white coat and is ready to learn to swim. Its mum leaves it all alone and goes back to sea to feed. The pup now needs to build up the confidence to take the plunge into the sea and hunt for its own food. Luckily, they can stay under water for half an hour at a time. During this time, they hunt for fish and crabs for a tasty treat. Have you ever held your breath underwater? How long did you manage?

Fun fact

The scientific name for the grey atlantic seal is Halichoerus grypus. This means hook-nosed sea pig.

Keeping our shorelines clean

There is an increasing amount of plastic waste on our shores which is a big threat to our marine life. How about taking part in a ‘beach clean-up?’ All you need is a bag to collect the litter, preferably a bag and a pair of gloves. Collect any litter found on the beach. Hint - look out for micro plastics. These are small bits of plastic that can be really harmful to marine life. Make sure you properly dispose of the waste.

People taking part in a ‘beach clean-up’.

Keeping our shorelines clean is extremely important. There are alarming headlines in the media showing evidence of beach litter. Marine life is dying because of this. If you see litter on the beach please pick it up, if it is safe to do so. It’s wonderful to enjoy the natural beauty of the sea and sand. Beaches can be enjoyed by people of all ages. Please help to keep our beaches safe and clean.

Quiz: What is the largest mammal that comes to our shores?

Where next?

What happens when plastics get into the ocean?

Find out what impact plastic waste has on wildlife in the sea.

What happens when plastics get into the ocean?

Can lobster fishing be sustainable?

How has fishing changed in Wales and how does this affect the food chain?

Can lobster fishing be sustainable?

KS2 Sustainability

A collection of lessons for pupils aged 7 to 11

KS2 Sustainability