It’s an all too common phenomenon these days: larger specimens of something terrifying are becoming more and more common. The latest arrival is the swamp spider – one of Britain’s largest arachnids – also known as the giant swamp spider.

In 2010, marsh spiders were threatened with extinction. Now, thanks in part to the efforts of the Royal Society for the Protection of Birds (RSBP), a record number of up to 3,750 female marsh spiders have turned up in marsh ditches at 12 different locations in the Norfolk and Suffolk Broads in the UK, according to The Independent.

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What exactly are these rare spiders and should we be worried? Yes, we should. They can grow as big as a human hand and build a web 25 centimeters or almost 10 inches long. Admittedly, they don’t pose much of a threat to humans as their bite would leave marks like a bee sting – and they are quite shy so they tend to run away anyway. Still scary!

These creepy crawlies do not feed on human flesh, but on aquatic creatures, including fish. Unbelievable but true: swamp spiders can cross the water surface. At this point, the only thing they lack is the ability to jump.

Your dismay aside, the RSBP is very keen to reintroduce this species. Tim Strudwick, the Site Manager of the RSPB’s Mid Yare Nature Reserve, told the Daily Mail that they were “proud” of the role they had played in this re-emergence, pointing out that their “important role” was to help maintain “the rich aquatic diversity in the grazing ditches”.

All this happened shortly after another discovery was made off the coast of San Diego. This is where the “doomsday fish” was spotted. In other words, people are not safe anywhere.