BLUE DRAGON (Glaucus atlanticus). Small slug that measures only about 2 cm and is generally associated with the Portuguese man of war (Physalia physalis), although it also usually appears in intertidal pools. Marine invertebrates of the Canary Islands, Tenerife.,Image: 597130364, License: Rights-managed, Restrictions: ILLUSTRATION IMAGE Model Release: No, Model Release: no, Credit line: Sergio Hanquet / AFP / Profimedia

Blue Dragon (Glaucus atlanticus) hanging. Small slug that measures only about 2 cm and is generally associated with the Portuguese man of war (Physalia physalis), although it also usually appears in intertidal pools. Marine invertebrates of the Canary Islands, Tenerife.,Image: 597085454, License: Rights-managed, Restrictions: ILLUSTRATION IMAGE Model Release: No, Model Release: no, Credit line: Sergio Hanquet / AFP / Profimedia

Blue Dragon (Glaucus atlanticus). Small slug that measures only about 2 cm and is generally associated with the Portuguese man of war (Physalia physalis), although it also usually appears in intertidal pools. Marine invertebrates of the Canary Islands, Tenerife.,Image: 597085450, License: Rights-managed, Restrictions: ILLUSTRATION IMAGE Model Release: No, Model Release: no, Credit line: Sergio Hanquet / AFP / Profimedia