Monterey Bay Aquarium
The black jellyfish is considered a giant jelly; its distinctive purplish bell can reach over three feet (91 cm) in diameter; its lacy, pinkish oral arms can reach nearly 20 feet (6 m) in length and its stinging tentacles 25 feet (7.6 m) or more.
Rare and beautiful jellyfish have been spotted recently at California beaches. They are believed to be Black Jellyfish, a type which hasn't been seen near the state for several years.
Fore more on this we're joined by Nigela Hillgarth of the Birch Aquarium in La Jolla.