The Bloodcomb jelly consists of two interlaced creatures. The jelly itself is transparent, but colonies of bioluminescent bacteria live on its ‘combs’ (racks of little paddles), creating a kaleidoscopic color output. The jellie‘s predators live at lower depths, and the interference pattern created by the bacteria and the motion of its combs works as a stealthing mechanism. The bacteria gain increased mobility and access to more food sources. Both species benefit, and have evolved into a single, irreducible organism.