National Geographic : 1995 Feb
more than a third of the diet and primates slightly less than a third. The eagles prey on ani mals as large as 11-pound red howler monkeys and even 17 pound two-toed sloths, creatures too heavy to be carried whole. We recently found that harpy eagles also feed on birds such as macaws, smaller parrots, and gray-winged trumpeters, though these make up only about 5 per cent of the prey taken. Knowing what harpies eat could help determine the size and type of S-. habitat preserve needed to safe guard the eagle population.