The alternating tides make the landscape change very often. At low tide, a new " world " appears : crabs, anemones, seaweeds, and shells live in this delicate environment.

 The small islands in the bay of Morlaix belong to the ornithological reserves of the North of Brittany. This bay is a lookout post for birds fanciers. Indeed, you can see , for example, some terns, some cormorants, and many gulls