Aquatic animals are creatures that live in water environments, including oceans, rivers, and lakes. Many different types of animals fall into this category, including fish, whales, dolphins, sharks, and alligators. Some other synonyms for aquatic animals might include "marine animals," "water creatures," and "aquatic vertebrates." While fish are perhaps the most commonly recognized type of aquatic animal, there are also many other fascinating creatures that live in water environments. For example, sea turtles, otters, and even certain types of frogs and salamanders are considered aquatic animals. Overall, these creatures play an important role in their respective ecosystems and are an essential part of the natural world.