Sea animals

Sea animals are a diverse group of creatures that live in oceans, seas, and other saltwater environments. They range from tiny plankton to the massive whales. Some, like fish, have gills to breathe underwater, while mammals like dolphins and whales breathe air through lungs. Others, such as jellyfish and corals, are invertebrates without a backbone. Sea animals play vital roles in maintaining healthy ecosystems, supporting food chains, and influencing climate. They have adapted to various habitats—from coral reefs to deep-sea trenches—and many are vital for human livelihoods, recreation, and scientific research.