How some superblack fish disappear into the darkness of the deep sea
A layer of pigment-containing structures just below the skin’s surface traps nearly all light
Some fish living in the deep sea, including this Pacific blackdragon (Idiacanthus antrostomus), have ultrablack skin that absorbs almost all light that hits it. The skin may help hide the animals from predators or prey.
K. Osborn/Smithsonian National Museum of Natural History