In the shelter of the rocks of the Deiro, a discreet and fascinating animal is hiding: the European Otter. It feeds on fish, but especially on amphibians or crayfish. This animal, which spends a lot of time playing, is a witness to the quality of the water and the preservation of the environment. Once prized by trappers for their fur, otters had almost disappeared. Today, the otter is present on all the watercourses.