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Glaucus atlanticus is a sea slug, a pelagic nudibranch. At the taxonomic level it is a mollusc of the Gastropoda class, in the family Glaucidae and the only species of the genus Glaucus. Usually, they live in the Atlantic Ocean, although specimens have been found in all oceans. It prefers mainly temperate and tropical waters, which is why its sighting is more frequent in Mozambique and South African waters. Its camouflage is one of its best adaptations to survive The sea swallow inhabits the shallowest part of the water, which is the most dangerous area for a prey. In the part seen from the sky they are almost invisible, because their bright blue color camouflages them with the sea, being exactly the same color as it and therefore, avoiding being seen by birds. At the bottom they are silver, achieving the same mimicry effect so that fish do not see them. On the back it has two lines of a deeper blue that go through its body to the tip of its tail. In between, there is a thicker one th...