Thousands of giant fish-eating spiders ‘once on brink of extinction’ found in UK – as map reveals where colonies lurk

THOUSANDS of giant fish-eating spiders the size of your hand have come back from the “brink of extinction”.

A map has revealed where colonies of the fen raft spider are lurking after the critters had their “biggest mating season on record”.

Fen raft spiders can run across the surface of water to catch their prey and they’re able to detect the slightest movements below the surface thanks to tiny hairs on their legs.

Their webs can stretch up to a whopping 25cm, making them the size of a pizza.

The creepy crawlers were introduced to four sites in the Norfolk and Suffolk Broads, in eastern England.

It came as part of Chester Zoo’s mission to see the species’ population rise, after they had been in terminal decline.

Arachnophobes may be terrified to learn zoologists released thousands of the eight-legged creatures – which can “grow to be the size of your hand” and “you can’t miss them”.

And subsequent research has shown the semi-aquatic spiders are thriving in Norfolk.

The RSPB said there are now potentially 3,750 females at Mid Yare Nature Reserve, on the Norfolk Broads.

The Mid-Yare Marshes are a biological Site of Special Scientific Interest east of Norwich in Norfolk, England.

The resurgence of the creature has been named one of the RSPB’s “major nature wins” of 2024.

RSPB chief executive Beccy Speight said: “This year has secured major nature wins – from the historic sandeel fishing closure to saving species like Saiga antelope from extinction – the RSPB has demonstrated what can be achieved through vital conservation efforts.”

Fen raft spiders were also translocated in the Castle Marshes, a nature reserve west of Lowestoft in Suffolk managed by the Suffolk Wildlife Trust and the Carlton Marshes, situated in the Waveney Valley at the southern tip of the Broads National Park, on the Suffolk-Norfolk boarder.

The final translocation site was the Ludham Marshes, a nature reserve within the Broad National Park.

Meanwhile, there are remnant populations in South Wales, East Sussex and East Anglia.

Chester Zoo said: “Ten years ago we helped release thousands of giant spiders back into the UK!

“The Fen Raft Spiders were bred right here at the zoo, and we’re super happy to report there are now more than 10,000 breeding females and they’ve just had the biggest mating season on record!”

Although they may look threatening, this species of spider is harmless to humans.

Chester Zoo highlighted how they play an integral part within aquatic ecosystems.

Their diet includes other spiders, damselflies, dragonfly larvae and pond skaters, and they will even catch fish and tadpoles. 

However, 15 years ago, the species almost became extinct after the destruction of its wetland home.

In order to save the species, the zoo raised hundreds of baby spiders in individual test tubes as part of a collaborative conservation breeding rescue programme in partnership with the RSPB.

Chester Zoo said: “Our team delicately hand fed tiny flies to each of the hundreds of spiderlings using tweezers, day in, day out, for weeks on end in our bio-secure breeding facility.

“Eventually, the young spiders grew strong enough to be returned to their natural habitat, which our partners worked to restore, and we released them in their hundreds!”

But, if spider fearing Brits wish to keep the creepy crawlers out of their homes this winter – here is a list of tips from an expert.