On Julian’s fourth video playing with the Blue glaucus, one commenter wrote, “If it’s a vibrant color, by the law of nature, don’t touch it.” Many creatures in the animal kingdom who sport bright, vibrant colors are often poisonous, including the poison dart frog, the coral snake, the flamboyant cuttlefish, the crown of thorns starfish, and other nudibranch species similar to Blue glaucus.
Source: https://www.distractify.com/p/blue-glaucus-sea-slug-tiktok