They have waterproof feathers
Penguins’ feathers are coated in a waterproof oil produced by an adaptive gland called the preen gland, shares Corbin Maxey, an animal expert and biologist. Penguin chicks, however, do not have waterproof feathers, which is why they stay out of the water. Penguins also have a higher feather density than most birds, more than 100 feathers per square inch, and at the base of each feather is a small muscle that holds the feather tightly to the body to trap warm air, explains Maxey.
Their “tuxedo” isn’t just a fashion statement
Counter-shading, or camouflage, helps penguins hide from predators or prey in the water, says Maxey. When viewed from below, their white bellies blend in with the light near the surface of the sea. When viewed from above, their black backs are hard to see in deep, dark water. Don’t miss these 17 photos of adorable baby animals will brighten your day.