The BBC reports thousands of “giant spiders” which were released into the wild by a zoo are thriving in the wild and have had a record mating season, conservationists have said.

Chester Zoo released the spiders a decade ago as part of a project with the RSPB which aimed to save the species from extinction.

More than 10,000 breeding female Fen Raft spiders have been recorded this year, with zoo bosses hailing the breeding programme “a success”.