Marine animals are animals that live in the ocean and have adapted to the diversity of the marine environment. They include various fish, mammals, invertebrates, and reptiles. Typical marine animals include whales, sharks, dolphins, turtles, octopuses, corals, starfish, and seahorses. Marine animals live in different layers of the ocean, from shallow to deep sea. They play an important role in the food chain and maintain the balance of the marine ecosystem.