Photo by @donaldmiralle An adult bald eagle flies over the water between islands off the coast of Juneau, Alaska. With one of the highest concentrations of bald eagles in North America, Alaska has an estimated 30,000 of these birds of prey flying in the skies, nearly equaling Juneau's human population. Alaska's largest resident bird of prey, the bald eagle has a wingspan of up to 7.5 feet and weighs between 8 and 14 pounds.