Would you congratulate an organisation which set free 400 spiders which can grow as big as mice?

Chessington World of Adventures has won gold at the annual BIAZA awards, which reward organisations for their conservation efforts.

This is because they set free hundreds of fen raft spiders, which can grow up to almost three inches long.

Fen raft spiders are the largest of the UK's 660 spider species.

They are very distinctive-looking; the spiders have brown or black bodies with white or cream stripes along the sides.