Spiders the size of a hand on the loose in the UK after being released by zoo

The fen raft spider is now flourishing in the UK (Picture: Gamma-Rapho)

Massive spiders the size of a human have had a record breeding year in the UK after a zoo released them into the wild.

Chester Zoo bred the fen raft spiders before setting thousands free ten yeas ago in an effort to save the species, which was close to extinction in this country.

The zoo has now revealed there are more than 10,000 breeding females across the UK – an all time high.

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!’

While they may appear intimidating due to their size, the fen raft spider is actually harmless. It also plays a vital role within healthy aquatic ecosystems, the zoo said.

Fen raft spiders are semi-aquatic spiders, named for their ability to run across the surface of the water to catch their prey.

The fen raft spider is big but harmless (Picture: Universal Images Group Editorial)

They actively hunt their prey instead of building webs to catch their next meal.

Their legs are covered in tiny hairs that detect the slightest of vibrations on the water’s surface which they can run across to capture their prey.

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 had almost became extinct after the destruction of its wetland home.

In order to save the species, the zoo set about rearing 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.

Chester Zoo released the spiders into the wild (Picture: Google)

‘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!’

RSPB Mid Yare nature reserves site manager, Tim Strudwick, said: ‘The fen raft spider is one of the UK’s rarest invertebrates and we are proud of the role our reserves and teams have played in its recovery.

‘These spiders have an important role in maintaining the rich aquatic diversity found in the grazing ditches on our reserves. The females are impressive in size, but also beautiful – they are truly special to see!’

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The 10,000 breeding females figure was estimated by the RSPB after research.

The fen raft spider isn’t the only spider species thriving in the UK this year. As reported in August, the UK’s wet summer conditions created the perfect breeding ground false widow spiders.

These spiders can inflict an extremely painful bite and ae the most venomous in the UK.

Their venom causes swelling like painful burns and fever but thankfully they will not kill you.

Get in touch with our news team by emailing us at webnews@metro.co.uk.

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