Endangered water voles are being offered food covered in edible glitter in the hope that conservationists will be able to track their movement in the wild.
The edible and biodegradable glitter – the type used to decorate cakes – should come out in their poo, allowing the small mammals to be tracked.
Different colours of glitter could be used to allow experts to track different families of water voles and how far they range.
Rob Parry, chief executive of Nature Conservation Cymru, said his team had consulted with vets to ensure it would not be harmful to the semi-aquatic creatures.
Video filmed by Johnny Brew and edited by Erin Lister