| Demonstrating countershading, the turtle's underside is lightly colored. |
| The downward-projecting photophores may provide countershading by obliterating the silhouette when it is viewed by a predator from below. |
| This countershading makes them hard to see, both from above and below, when swimming. |
| The countershading of bat rays, a form of camouflage, protects them from predators above and below. |
| We therefore report two experiments designed to test whether countershading enhances protection by diminishing the probability of detection by predators. |
| It is a good example of countershading, as its light-coloured back, seen from below, blends into the water surface and sky. |
