Marine creatures are animals that live in oceans, seas, and other saltwater environments. They include a wide variety of species, such as fish, mollusks, crustaceans, and marine mammals. These creatures play essential roles in their ecosystems, contributing to the balance of marine life and food chains. Many marine creatures have unique adaptations that help them survive in their aquatic habitats. For example, fish have gills to breathe underwater, while whales and dolphins are adapted for life in the ocean with streamlined bodies and the ability to communicate through sounds. Understanding these creatures is vital for marine conservation efforts.