People are being encouraged to help spot water voles in ponds and streams because they are “Britain’s fastest declining mammal”.

Water vole populations have declined by 90% due to habitat loss, fragmentation and becoming prey of the non-native American mink, according to wildlife charity People’s Trust for Endangered Species (PTES).

Volunteers can choose from over 700 pre-selected riverbank sites across England, Scotland and Wales – or register a new site near them.