All Dolled Up!
So why are penguins black and white? This adaptation is a kind of camouflaging called counter-shading, which makes it harder for both their predators and their prey to see them. When penguins are in the water, their white chests camouflage them from being seen from below against the lighter sky. From above, their black backs help them blend in with the darker blue ocean waters. (Aquarium of the Pacific)
See the formal-wear, Magellanic Penguins here on the live cam!