The national park is quite diverse in its wildlife and vegetation, hosting approximately 804 distinct species of plants, 256 bird species, and an otherwise considerable variety of mammals, reptiles, and marine life. The entirety of the national park, including both Dilek Peninsula National Park and Büyük Menderes Delta National Park, is currently protected under the Ramsar Convention, the Berne Convention on the Conservation of European Wildlife and Natural Habitats, the Rio Convention on Biological Diversity, and the Barcelona Convention.