Here on Mount Desert Island, seeing an eagle is special, but not unusual. Adult eagles are very beautiful and are here throughout the year. Their size is impressive, with a wingspread of 6 to 7 1/2 feet. Eagles are mainly fish eaters. They let other birds, like osprey, catch the fish and then they steal it by making the other bird drop it. Eagles can catch fish on their own, but they prefer letting other birds do the work. Although not elegant, eagles will also be happy with finding and eating dead fish and even roadkill.