Great Eggcase Hunt

You can become a citizen scientist by helping us find and record shark eggcases

WHAT IS AN EGGCASE?

Some sharks, and all true skates, reproduce by laying eggs. These are surrounded by a tough leathery capsule that protects the embryo as it develops inside. After several months these are ready to hatch, and a fully-formed shark or skate will emerge.

Once empty, the eggcases (or mermaid’s purses) often wash up on the beach. One of the best places to find them is among the strandline, where the seaweed washes up. The eggcases of different species vary. So, by looking at the size, shape and features, we can tell which species laid it. You can learn to identify eggcases too. We’ll show you how!

THE PROJECT

The Great Eggcase Hunt began in 2003 following a chance find on a beach in Devon. The project quickly developed with the aim of getting as many people as possible out hunting for eggcases and recording their finds.

Empty eggcases can help indicate species presence and diversity. By recording your finds, you're helping us to discover more about egglaying species in our waters.

Eggcases wash up all year round. So, whatever the time of year keep your eyes peeled!

EGGCASES UNDERWATER

As well as documenting empty eggcases, we're keen to receive records of eggcases developing in-situ.

Underwater records help us pin-point exactly where sharks and skates are laying and can be linked to beach records. Learning the depth and substrate that they lay on also helps us to better understand the species.

So, if you're a diver, snorkeller, stand-up paddleboarder, or anyone who enjoys spending time in the water, keep an eye out. Often they're extremely well camouflaged and can have marine organisms such as algae growing on them. If you do spot one make a note of the location and, if possible, take a photo. Then record your finding as normal.

Remember - these eggs may contain a live shark or skate, so it's important not to disturb them.

EGGCASES AROUND THE WORLD

Eggcase hunting has taken off in a big way! What began as a British Project has now expanded around the world. We’ve got records from Ecuador to South Africa to Australia. And many places in between. In total, we've had 30 species reported from 22 countries.

We've also been working with other organisations to bring you the:

Grote Eikapsel Jacht in partnership with the Dutch Shark Society (launched in April 2015)
Grande Caça Ovos in partnership with the Portuguese Association for the Study and Conservation of Elasmobranchs (APECE).

Sister projects to the Great Eggcase Hunt have been set up in:

France (Programme CapOeRa by APECS)
Ireland (Purse Search by Marine Dimensions)

EGGCASE RECORDS

Thank you to everyone who has taken part in the Great Eggcase Hunt!

Together we’ve recorded over 250,000+ individual eggcases - that's a lot of eggcases! The database is continuing to grow, with more and more records being submitted, including many from around the world.

► Download our Report Celebrating 100,000 Eggcases (pdf)

Eggcase Surveys (2003-present day)

We need to see photos or specimens for us to publish records as verified. Those we haven’t seen are considered unverified and these records may not be accurate.

► Click here to view interactive maps on our Recording Hub

Student Projects - If you’d like to use any of these results for a student project, please contact us first. Provide us with a summary of your project and the information you'd like to use but please be aware we're not able to release the entire raw dataset.

Is your home beach or favourite stretch of coastline covered? If not, why not get involved? Eggcase hunting is a great way of finding out what sharks and skates live off your stretch of coastline.

Great Eggcase Hunt Appeal

Our flagship citizen science project continues to expand as we welcome new recorders from around the world. Donate today and help the Great Eggcase Hunt go from strength to strength.

Latest

COVID-19

We’re still here, we’re just not here. We’re working from home. We’re doing everything we can to maintain business as usual but there are some things that we won’t be able to do from home.
Stuck for Ideas this Easter?

We’ve got an Easter Egg Hunt with a difference that’s sure to put a smile on everyone’s face. Back by popular demand our Indoor Easter Eggcase Hunt Trail can be done in the home or garden!
CREATURE FEATURE: Blue Shark

The beautiful and bold Blue Shark is named for its dazzling colour. Sleek and agile, they have a distinctive cone shaped snout and large endearing eyes.
For the Love of Sharks 2020

Due to Covid-19 this event has been postponed until the 25th September. Early bird tickets are now on sale. We look forward to seeing you in the Autumn.

Shark and Ray Entanglement Network

Plastic pollution affects a variety of marine species including turtles, cetaceans and seals. But little is known about the susceptibility of sharks and rays to this threat.
Our Work

We believe the best way to safeguard the future of sharks is through a solutions-based approach that promotes positive change. Like a jigsaw, there are many pieces that make up the big picture.
Basking Shark Project

Help us learn more about these gentle giants by keeping a look-out for them during May-October. If you spot one, record your sighting to our Shark Sightings Database.
Angling Project

Anglers are uniquely placed to record a wide range of important information on sharks, skates and rays. Record your catch online or download our app.
Shark Sightings Database

Help us learn more about sharks, skates and rays around the world by recording your sighting(s) to our Shark Sightings Database.
Get Involved

Together let's safeguard a future for sharks in our oceans. We've got lots of ways you can get involved. From becoming a member or citizen scientist to fundraising and volunteering.