An eagle fluffs his feathers, warning the bird behind him not to mess with his meal.
Eagles are not only skilled hunters, they are also skilled at spotting a free meal when the opportunity arises. But the bald eagle in the forefront of this image is determined to keep his catch.
An eagle who is alarmed is likely to sit up in an alert posture, making themselves appear larger, and it may begin vocalizing.
Stock Image #20121119-132923