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Carnivorous aquatic vertebrates (about 116 species) with limbs evolved into fins, skin that is smooth or covered in short hairs, and sometimes a dorsal fin.
examples of marine mammals
Marine mammals: many actively hunted species (more than 110 out of 116) are protected or are subject to hunting restrictions.
Marine mammal without hind limbs; it uses echoes of the sounds it emits (sonar) to orient itself and detect its prey.