Scientists at Chester Zoo have implanted fluorescent silicone gel into the legs of frogs to better identify the more than 80 individual amphibians in their collection.
The frogs - Golden Mantellas - were not harmed by the implants.
Amphibian experts will at the zoo will now monitor the frogs. If it's a success, they will be used to track the species in their native home of Madagascar.
Take a look at more pics of the little glowing fellas below.