Camargue is a major world heritage wetland and is host to many fragile ecosystems. The exceptional biological diversity is the result of water and salt in an "amphibious" land inhabited by numerous species.Ponds and marshes cover a large proportion of the river delta. Partly dry in summer, the shallow (20 to 80 cm) marshes are subject to the unpredictable seasonal weather patterns of the Mediterranean climate. They are nevertheless, with the ponds, habitats of choice for both migratory and sedentary birds. egrets, night herons, bitterns, mallards and wagtails are common guests in this fragile ecosystem. Since areas like this are rare in Europe, they are carefully protected by all the organizations responsible for protecting Camargue wildlife.