Marine creatures are animals that live in oceans, seas, and other saltwater environments. They include a wide variety of species, such as fish, whales, dolphins, and sea turtles. These creatures have adapted to their aquatic habitats, developing features like gills for breathing underwater and fins for swimming. Many marine creatures play essential roles in their ecosystems. For example, coral reefs provide shelter for numerous species, while plankton serves as a primary food source for many larger animals. Understanding these creatures helps us appreciate the biodiversity of our oceans and the importance of conserving marine environments.