Grass snake at Caen Hill lock
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Kennet and Avon grass snakes take to the canal

8 August 2013 Last updated at 07:49 BST

A lock keeper on a canal near Devizes managed to film grass snakes swimming in the lock during the recent hot weather.

Alan Giddings, who has worked on the Kennet and Avon canal at Caen Hill for almost 36 years, said he had never seen so many of the creatures, which tend to stay hidden.