Aquatic animals are creatures that live in water, including oceans, rivers, lakes, and ponds. They can be found in both saltwater and freshwater environments. Common examples of aquatic animals include fish, whales, dolphins, frogs, and crabs. These animals have adapted to their watery habitats, often developing features like gills for breathing and fins for swimming. Many aquatic animals play important roles in their ecosystems. For instance, coral reefs provide shelter for various species, while plankton serves as a primary food source for many larger animals. Understanding aquatic animals helps us appreciate the diversity of life in our planet's water bodies.