This category comprises of aquatic creatures that are at the brink of extinction due to various environmental and human-based factors. These animals, which reside in marine ecosystems, are studied under the field of marine biology. They are often referred to as wild animals due to their natural habitat. The category includes a diverse range of species, from small fish to large mammals like the Rhinoceros Dolphin, all of which play a crucial role in maintaining the balance of marine life.