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Certain jellyfish can be very dangerous to humans. Even a small sting from the jellyfish called sea wasps can kill a person within 

 They are found in all oceans. Most live at or near the surface of the water.
Thin tentacles run around the edge of the body.

mammals that live in and around water. Unlike most other animals, otters are playful even as adults. They like to slide down riverbanks and in snow. Otters are found throughout Africa, North and South America, Europe, and Asia. They belong to the weasel family. They eat fish, shellfish, and other water animals  Otters have a slender body, a long neck, and short legs. They are typically 3 to 5 feet (1 to 1.5 meters) long and weigh between 6.5 and 60 pounds (3 and 27 kilograms). 

corals and sea anemones. There are about 200 species, or types, of jellyfish.A typical jellyfish is shaped like a bell or an umbrella. Some jellyfish are hardly large enough to be seen. Others are more than 6 feet (2 meters) across. Jellyfish can be transparent (see-through), white, brown, pink, blue, or maroon. Some jellyfish have eyes around the edge of the body. The mouth and stomach are in the middle of the body.

A jellyfish may have a few or many tentacles. Thin tentacles run around the edge of the body. Four or more larger tentacles hang down from the middle of the body, below the mouth. The tentacles are lined with stinging cells that make poison. The poison can stun small animals. The tentacles then pull the animals into the mouth.