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The Bald Eagle (Haliaeetus leucocephalus) adult has a very dark brown body with a distinctive white head and tail and strong yellow beak. They do not have this coloring until about five years old, when their eyes and beak turn yellow too. Females are larger than males and weigh up to 15
pounds. Mature eagles are 29 to 42 inches long with a wingspan of six to eight feet. Bald Eagles live more than 30 years in the wild and mate for life, seeking a new partner only if one of the pair dies. Their large nests, lined with twigs, soft mosses, grasses and feathers, are called eyries, and are built at the top of tall, sturdy trees.