The short Rivelottes walk only reveals a tiny part of La Calestienne which is Natura 2000 listed. However, it gives you an idea of the biological wealth on this site: a magnificent chalk grassland, and a forest at the bottom of the valley where ash trees dominate alongside elms, alders, rowans and elderberry trees. The chalky grassland came from the practice of extensive grazing, i.e. there were few animals per hectare. The end of the walk is along a quarry that is no longer in operation. It is not uncommon to see wild carrots and oregano there. Or you may even come across a slow worm, the lizard with no feet.