The Mielle, a small stream that rises in Agnos, is listed in the Natura 2000 program for three rare species: white-clawed crayfish, European pond turtles, and the rare European mink which does not exist anywhere in France except in the south-west.
This species hosts several species of parasites, including Haemogregarina stepanovi, monogeneans of genus Polystomoides, vascular trematodes of genus Spirhapalum and many nematode species.
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