Volunteers sought to help build homes for otters

They've had films made.. and books written about them - and they are one of our most popular riverside mammals. The Otter was facing extinction in Britain several decades ago, but it is now having a resurgence - with a little helping hand from ecology experts.

They have now appealed for volunteers to help build a series of Otter holts - or dens - starting with one on the banks of the River Trent near Gainsborough in Lincolnshire. David Hirst reports.

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