The lion's mane jellyfish (Cyanea capillata)

Lion's mane jellyfish (Cyanea capillata) are named for their showy, trailing tentacles reminiscent of a lion's mane. They can vary greatly in size: although capable of attaining a bell diameter of over 2 m (6 ft 7 in), those found in lower latitudes are much smaller than their far northern counterparts, with a bell about 50 cm (20 in) in diameter. Juveniles are lighter orange or tan, very young lion's manes are occasionally colorless and adults are red and darken as they age.