Penguin
All penguins have a white belly and a dark, mostly black, back. This is a type of camouflage to keep them safe when they swim because it makes them blend in with their background. The white and black colors make an effect called countershading. While a predator looking from below sees the white belly and wings of a swimming penguin, it can not see the penguin well because the light is coming from above. However, when seen from above, the penguin's black back blends in with the dark water below, so they are hard to see.