'Scrotum frogs' have gone on display at a British zoo as part of efforts to save the species.
A frog
The endangered amphibians are actually called the Lake Titicaca frog after their native home on the border of Bolivia and Peru but are given the crude nickname because of the saggy folds of skin which it uses to absorb oxygen from water at the bottom of the lake.
Twenty of the frogs are currently on display at Chester Zoo, which has teamed up with universities in both South American countries in a union to help save the creatures.
Dr. Gerardo Garcia, the zoo's curator of lower vertebrates and invertebrates, said: "We're very happy that we can now share our efforts to protect these frogs with the wider public, who will most likely be seeing them for the very first time during their visit the zoo."