Bald eagles have thousands of feathers. They have a staggering 7,000 feathers covering their body like a suit of armour. These feathers are both lightweight and strong, thanks to their hollow structure, meaning eagle can fly fast and take down prey. The feathers also keep the bird warm in cold weather, as they interlock and overlap to trap layers of air for insulation.

Their eyes are different to ours in a number of ways. Firstly, they have a pectin oculi, which is a structure found at the back of their eyes. It increases the blood supply, meaning there are not as many blood vessels covering the retina, giving them much clearer vision than mammals. They also have two focal points, enabling the birds to look both forwards and to the side. Besides this, they can see ultraviolet light and close their eyelids (the nictitating membrane) and still see!