Harbour seal

Harbour seal illustration by A. Francis, courtesy of Brighton Dolphin Project.
The harbour seal, also known as the common seal, is a true seal found along temperate and Arctic marine coastlines of the Northern Hemisphere. The most widely distributed species of Pinniped (walruses, eared seals, and true seals), they are found in coastal waters of the northern Atlantic, Pacific, Baltic and North Seas.

An adult can attain a length of 1.85 m (6.1 ft) and weight up to 168 kg (370 lb). 

Did you know?

Harbour seals can dive deeper than their Grey cousins, diving to 427 meters and staying underwater for almost 30 minutes. However, the average dive is usually a few minutes, going down to 90 meters. They also like to observe humans walking on beaches from the safety of the water, but are wary of humans on land and will rush to the sea if disturbed.

Harbour porpoise

Harbour porpoise, illustration by A. Francis. courtesy of Brighton Dolphin Project


The Harbour porpoise is one of seven species of porpoise. As its name implies, it stays close to coastal areas or river estuaries. This porpoise often ventures up rivers and has been seen hundreds of miles from the sea. It is one of the smallest marine mammals. Adults grow to 1.4 to 1.9 m (4.6 to 6.2 ft)

Did you know?

The name “porpoise” comes from the Latin for pig (porch). Harbour porpoises are therefore sometimes called “puffing pigs”, due to the sound they make as they breathe. Interestingly, when surfacing for air, these porpoises do not splash; instead they roll from their beak to their fluke and arch their back.

White-beaked dolphin


White-beaked dolphin, illustration by A. Francis, courtesy of Brighton Dolphin Project

The White-Beaked Dolphin is a robust species of dolphin with a short beak. Adults can reach 2.3 to 3.1 m (7 ft 7 in to 10 ft 2 in) long and weigh 180 to 354 kg (397 to 780 lb). 

Did you know?

Each jaw of the White-beaked dolphin holds 22-28 pairs of small, conical-shaped teeth, which help the animal easily grasp prey. Fishermen in Canada call this dolphin ‘Squidhound’.

Sussex sighting 

Common dolphin

Common dolphin, illustration by A. Francis, courtesy of Brighton Dolphin Project
The Common Dolphin is the most abundant cetacean in the world, with a global population of about six million. Adults range between 1.9 and 2.5 m (6.2 and 8.2 ft) long, and can weigh between 80–235 kg (176–518 lb).
Did you know?
Common Dolphins are one of the only tricolour dolphins – grey, white and yellow in a distinctive hourglass pattern.

Bottlenose dolphin

Bottlenose dolphin, illustration by A. Francis, courtesy of Brighton Dolphin Project

Bottlenose dolphins inhabit warm and temperate seas worldwide, being found everywhere except for the Arctic and Antarctic Circle regions. Their name derives from the Latin tursio (dolphin) and truncatus for their characteristic truncated teeth. Adults weigh an average of 300 kg (660 pounds) and can reach a length of just over 4 meters (13 feet).

Did you know?

Bottlenose dolphins can reach speeds over 30km per hour and dive as deep as 250m below the surface.

Sighting 1 mile off Shoreham 

Marine mammals

The Sussex Coastline is home to an abundance of marine wildlife including six species of marine mammals! The team at Brighton Dolphin Project gives us top tips on the mammals we should keep an eye out for.

Brighton dolphins

In Sussex, we are lucky enough to have not one not two, but three species of Dolphin that are regularly spotted in our waters!Bottlenose Dolphins that are here year round and regular visitors in the form of Common Dolphins and White-beaked Dolphins.

The world’s smallest marine mammal

Our coastline is also home to one of the smallest marine mammals, the Harbour Porpoise. We also have two seal species; the grey seal and the Harbour (or Common) Seal. Click on each species to find out more.

Bottlenose dolphin

Bottlenose dolphin
Bottlenose dolphins inhabit warm and temperate seas worldwide, being found everywhere except for the Arctic and Antarctic Circle regions. Their ...
Read More

Common dolphin

Common dolphin
The Common Dolphin is the most abundant cetacean in the world, with a global population of about six million. Adults ...
Read More

White-beaked dolphin

White-beaked dolphin
The White-Beaked Dolphin is a robust species of dolphin with a short beak. Adults can reach 2.3 to 3.1 m ...
Read More

Harbour porpoise

Harbour porpoise
The Harbour porpoise is one of seven species of porpoise. As its name implies, it stays close to coastal areas ...
Read More

Harbour seal

Harbour seal
The harbour seal, also known as the common seal, is a true seal found along temperate and Arctic marine coastlines ...
Read More

Grey seal

Grey seal
The grey seal is found on both shores of the North Atlantic Ocean. It is a large seal of the ...
Read More

Dolphin spotting 

Brighton Dolphin Project research and study these Marine mammals. Part of our work is based on recording sightings, where we ask people to report any sightings and tell us about their experience. Here are a few of the most recent and exciting sightings!  Find out how far we come with our project and how you can get involved here.

Written by the team at Brighton Dolphin Project  


A guide to rockpooling in Brighton

Just off the coast of Brighton, tucked away beneath the waves we have a huge variety of marine habitats including hidden chalk cliffs and  reefs – with their rich and colourful diversity of life, they are as good as any tropical reef! When the tide is low, Rockpooling gives us a glimpse into this underwater world, and you don’t have to go far from Brighton to explore some of the best ones.

Rockpools near Brighton Marina along the Undercliff Walk

The Undercliff Walk

The closest pools to Brighton city centre are near Brighton Marina along the Undercliff walk. These pools are within the Beachy Head West Marine Conservation Zone (MCZ). Beachy Head West was one of the first MCZs to be established in the country. The chalk reef is among the best examples of marine chalk habitats in the south east, which supports so many species and when revealed, the Rockpools are full of hidden gems.

So…let’s get started!

First things first, check the tide times! Sometimes you only have a small window of time to search the Rockpools, so checking this is key. There have been a couple of times where I’ve  made my friends come with me, only to find the tide is in and the rockpools are covered. Don’t make my mistake! Good sites to use are magic seaweed or tidetimes.

Undercliff rockpools covered by the sea around mid-tide

Equipment and footwear

Footwear with a good grip is essential – the rocks can get really slippery; wellies or waterproof trail shoes work well,  but beach shoes are the best.  Don’t forget sunscreen, a hat and take plenty of water to drink – you will be really exposed to the sun on the rocks. The Wildlife Trust’s top tips for rockpooling shows you the basic equipment you need to take with you to safely observe the animals.

Searching along the rock pools

ID guides 

The Wildlife Trust’s Spotter sheet is a great way to help you identify your finds if you’re a first-timer. As you become more familiar with the species there are some excellent pocket guides out there like Collins Complete Guide to British Coastal Wildlife or The Essential Guide to Rockpooling 

Searching for animals 

The far end of the beach towards the sea is the best place to start your search as the deeper pools are here. You can then make your way back towards the beach to search the shallower pools. Animals like to keep cool and damp, so searching under rocks and overhangs will give you a better chance of spotting them. Turn rocks and seaweed over slowly and gently, the longer you look, the more chance you will see things. Listen out for the sounds of fish splashing and crabs clicking too.

Protecting wildlife

Turning over stones, Chitons hidden underneath

The animals in rockpools are quite vulnerable so ensure you turn rocks over and put them back as slowly as possible. Check constantly to see if anything has moved under where you are going to put the rock back. If you collect anything in a bucket don’t keep it in there for long as it will get stressed by the temperature. Return everything you find to the pools as close to where you found it as possible.

Always something new!

The best thing about rockpooling is you always spot something new each time you go. Here are some animals I have spotted during my time rockpooling this summer on the Undercliff pools.

Spiny spider crab 

Camouflaged spiny spider crab



Cuttlefish eggs 

Cuttlefish eggs

Shore crab

Shore crab

Strawberry anemone 

Strawberry anemone

Reporting your finds 

Reporting rare finds to wildlife charities can be really important as it helps be build up a more detailed picture of the wildlife that lives in specific habitats. If rare species are found their is a higher likelihood that the areas will be protected in the future. Find out how data reports helped towards creating Marine Conservation Zones here.

You can report your finds to: 

Sussex Biodiversity Record Centre 

You can find out about the latest interesting reported finds on the glaucus website



Underwater films

Our friends at Sussex Wildlife Trust have provided us with beautiful videos which explore what lives beneath the waters off the coast of Sussex.

What lives under the sea in Brighton & Hove?

There is a vast array of colourful and interesting wildlife and habitats living along the shores and off the coast of Brighton & Hove. Take an undersea journey to discover what lies beneath!
Film by BHEE, Brighton & Hove Environmental Education

What lives under the sea in Brighton and Hove? from Sussex Wildlife Trust on Vimeo.

What a Marine Conservation Zone should look like

Marine Conservation Zones aim is to protect our most vulnerable marine life and habitats. In Sussex, we have 9 Marine Conservation Zones  which cover around 22% of our local seas.

What a Marine Conservation Zone should look like from Sussex Wildlife Trust on Vimeo.

Sussex marine animal videos

Common cuttlefish

cuttlefish film from Sussex Wildlife Trust on Vimeo.


Rays film from Sussex Wildlife Trust on Vimeo.


seahorse film from Sussex Wildlife Trust on Vimeo.


dolphin film from Sussex Wildlife Trust on Vimeo.


seals film from Sussex Wildlife Trust on Vimeo.

Spot the difference

Many organisms that live today have barely changed their body shape in millions of years and look extremely similar to their ancestors. With the help of Sussex Wildlife Trust we have compared some of our Sussex chalk fossils, which are around 100 million years old, with modern animals that live in UK seas today.

Fossil Sea Urchin, Stereocidaris sceptrifera

Like many modern types living on the seabed, these sea urchins had spines as protection against hungry fish. This fossil is lacking it’s spines but you can still see where they would have been held.

Fossil of Stereocidaris sceptrifera, an ancient species of sea-urchin (or Echinoid).  Photo by Bob Foreman

Common sea urchin, Echinus esculentus

Common sea urchin, tube feet out©Paul NaylorSussex Wildlife Trust (1).JPG


Also known as the edible sea urchin. A large, round sea-urchin up to 15cm across with short, strong spines. Usually brick-orange in colour, with white bumps which the orange spines are attached to. Lives amongst seaweed and rocks, where it grazes on algae and small shellfish


Found on rocky shores, particularly around the north and west.

Fantastic facts:

An edible species, eaten particularly in Spain and Portugal.

Fossil fish, Ctenothrissa radians sp.

Fossil fish, Ctenothrissa radians sp., this is a rare complete example of this beautiful scaly fish which was found by Charles Potter in the late 19th Century.

Fossil fish, Ctenothrissa radians sp. Photo by Bob Foreman.

Black seabream, Spondyliosoma cantharus

black sea-bream juvenile©Paul NaylorSussex Wildlife Trust.jpg


The black sea bream, also known as a Porgy, is an omnivorous fish, eating seaweeds and small invertebrates.

Black sea bream breed in the Kingmere Marine Conservation Zone in Sussex between April and May. The males excavate a small shallow in the seabed, moving the gravel or sand around the edge to create a sort of crater into which the female lays her eggs. The male then protects the eggs until they hatch. He will fan them with his tail to keep them clear of sand or debris and wards off hungry predators, including smaller bream, wrasse and even whelks!

How to identify:

A large silvery fish, with an oval shape. Shaded bands running along the length of the upper flanks. It has a long single dorsal and anal fin and a small mouth. The tail is large and forked displaying a black band on it, most obviously noticeable on juveniles.

Juveniles usually have numerous broken yellow stripes running along the body. Spawning males are nearly completely black in colour, except for vertical white bars.


Found off south west Britain the Irish Sea and the English Channel.

Fantastic facts:

All black sea breams are born female! They change to males when they reach 30cm. All fish over 40cm are male.

Lobster, Palaeastacus dixoni

This rare fossil lobster was found in the Lower Chalk, Clayton, East Sussex and is from the Upper Cretaceous era. It has been preserved in wonderful detail.  First drawings of this fossil appeared  in scientific journals in 1850.   Collected by Henry Willet.

Lobster Palaeastacus dixoni Lower Chalk, Clayton, East Sussex.Photo by Bob Foreman.

Common Lobster, Homarus gammarus

common lobster©Paul NaylorSussex Wildlife Trust.JPG


A large crustacean, that grows up to 1 metre long, although more typically to about 50cm in lenght. Lobsters are a deep purplish-blue colour, with red antennae. They live in crevices and caves amongst rocks from the low tide mark and deeper. Their first pair of legs have massive grabbing pincers.

lobster film from Sussex Wildlife Trust on Vimeo.

How to identify:

Unmistakeable: other species of lobster are smaller and not the same colour


Found all round our coasts.

Fantastic facts:

Lobsters are nocturnal, hiding during the day in their caves.


Monster jaws

Who did these unusual teeth belong to?

With the help of Sussex Wildlife Trust we compared some of our fossil animal teeth from 85 million years ago to jaws of animals that live in UK seas today.

Shark fossil teeth,  Ptychodus sp.

Originally this  ray-like shark would have used a battery of such teeth for crushing molluscs and crustaceans.

Ray Lamna appendiculata sp., teeth fossil. Photo by Bob Foreman.

These teeth look quite similar to a tropical species of ray’s teeth – the Cow nosed ray, however these live in tropical shallow seas. The UK species of ray that we have chosen as an equivalent is the Thornback ray.

Thornback Ray, Raja clavate

thornback ray©Paul NaylorSussex Wildlife Trust.JPG


Thornback rays are regularly seen by divers. They have flattened bodies covered in blotches of colour to help them camouflage into the sand or mud or gravel. They have a long thorned tail. The males are smaller than the females.

How to identify:

Flat bodies with yellow and brown patches on their backs. Long thorny tail and protruding eye sockets.


Found all around the UK coast.

Fantastic facts:

Females can lay up to 150 egg cases every year. When the babies hatch, these cases are often washed up onto the beach.

Pipe fish jaw

These teeth would have belonged to a long-snouted slender fish, one of many similar bony fish that lived in the Chalk Seas of NW Europe.

Pipe fish jaw. Photo by Bob Foreman

Greater Pipefish, Syngnathus acus

Greater pipefish©Paul NaylorSussex Wildlife Trust.jpg


The pipefish has a long, segmented body, about 45 cm long. It lives in seaweed and seagrass and feeds on small prawns and mysid shrimp.

How to identify:

Thin segmented body with a long snout and a hump just behind the eyes


Commonly seen around the southwest coast and welsh coastlines.

Fantastic facts:

Just like seahorses, the males (not the females) look after the eggs in a brood pouch until they are ready to hatch.

…and finally we couldn’t resist adding our favourite sea creature which is protected in our Sussex Marine Conservation Zones…

Short-snouted seahorse, Hippocampus hippocampus

short-snouted seahorse©Paul NaylorSussex Wildlife Trust.jpg


Seahorses prefer to live in seagrass and shallow estuaries.

How to identify:

Distinctive horse like head with snout and a curling tail which is uses for holding onto things


Has been recorded along the south and southwest coasts of the UK.

Fantastic facts:

Seahorses usually mate for life and perform a courtship dance with their partner every morning. The male seahorses get pregnant and give birth to the young.


View more Monster Jaws from the Booth Museum’s in our Monster Jaw gallery