Whales are the largest mammals in the world and can weigh up to 200 tons.Dolphins are known for their playful behavior and high intelligence.Sea turtles can live for over 100 years and travel long distances in the ocean.Sharks are apex predators that play a crucial role in maintaining the health of marine ecosystems.Jellyfish are fascinating creatures that have been around for millions of years and come in a variety of shapes and sizes.