Bald Eagles: power and beauty. Bald Eagles on the shore of Peterson Bay across Kachemak Bay from Homer, Alaska. The ice covered rocks and icicles made for a beautiful setting to watch these magnificent birds. Female birds weigh on average 5.3kg whilst males weigh in at 4.2kg, on average. Large female bald eagles can weigh 7kg and have a wing span of 2.44m. They are big birds. Bald Eagles subsist mainly on fish which they catch by swooping down and snatching from the water with their massive talons. They are able to take whole salmon, birds, mammals and carrion. A bald eagle has been see taking a Mule Deer fawn weighing more than 6kg. Clearly, they are powerful birds!