- The Adaro were malevolent merman-like sea spirits found in the mythology of the Solomon Islands. Said to arise from the wicked part of a person's spirit, an adaro is described as a man with gills behind his ears, tail fins for feet, a horn like a shark's dorsal fin, and a swordfish or sawfish-like spear growing out of his head. Adaros live in the sun and travel to and from Earth by sliding along rainbows. Unlike the renowned mermaid, they are dangerous to humans and can kill them by travelling along rainbows and shooting them with poisonous flying fish. They may also travel in waterspouts.