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Fen Raft Spiders are making an "incredible comeback" in the UK with as many as 10,000 breeding females believed to be spread over 12 sites.
The Royal Society for the Protection of Birds (RSPB) has championed conservation efforts in Norfolk, with 3,750 spiders reportedly in the area.
These spiders can grow as large as the palm of your hand and are able to sit on the surface of water due to their hairy legs.
They can be identified by their brown or black body, and their white or cream stripes along their side.
As semi-aquatic arachnids, they tend to live in wetlands across the South of England Wales and can run across the water to catch prey, including fish.
The RSPB Mid Yare nature reserves site manager, Tim Strudwick, said: "The Fen Raft Spider is one of the UK’s rarest in