Bald eagles typically have wingspans of more than six feet with males weighing 6-9 pounds and females weighing 10-15 pounds. Like the bird in the first photo, they prefer to perch on sturdy branches of big trees. When there are fish to be had, however, their excellent sense of balance enables them to use sub-optimal perches as demonstrated by the bird in the other photos swaying about in the wind on the bent over leader of a white spruce.