An eagle is a large and powerful wild bird that has a big head and a strong hooked beak. The wings are broad and fast, while the claws are long and very powerful. Their legs are also muscular and strong and their eyes are prominent and big. The smallest of them measures up to 450 g (1 lb) and 40 cm (16 in), while the largest can be 8 kg (17.6 lb) and 9 kg (20 lb). The color of the feathers can vary from white and sandy to black and brown.