UK's rarest spiders fostered by zoos in bid to save them
21 September 2012 Last updated at 12:41 BST
There is a push to save one of the UK's rarest and biggest spiders.
The female fen raft spider (Dolomedes plantarius) can measure up to 7cm across and the body is brown or black in colour with white or cream stripes along the sides.
Nearly 2,500 spiderlings will be reared from September to November until they are strong enough to be released back into their natural habitats.
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