Jellyfish, the wobbly wonders of the ocean, often astound with their unique shapes, sizes, and stings. Learn more about these marine marvels as we dive deeper into the underwater world.

How big they are: From 5 to 32 feet (1.5 to 10 meters) long, depending on the species Dolphins live in almost every ocean, except most ... with other species for fun. Some species can swim ...