sentences:  They then often engage in a similar posture with wings spread wide and oriented toward the threat; sometimes rocking back on tail and even flopping over onto the back with talons extended upward as defense.Such behavior may be accompanied by wing slap against the threatening intruder.When approached by an intruder, the defending eagle turns away, partially spreads tail, lowers head, and remains still; adults on the nest may lower head and “freeze” when approached by a person or a helicopter.