Chester zoo worked with the RSPB to raise hundreds of baby spiders, keeping them separate in test tubes so that they did not eat one another.
The spiders were hand-fed with tweezers in the zoo’s bio-secure breeding facility until they were big enough to be released into the wild.
The fen raft spider is a harmless arachnid that plays a vital role in aquatic ecosystems, but 15 years ago was on the brink of extinction because of habitat loss.
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