sentences:  This courtship includes undulating displays by both in the pair, with the male bird picking up a piece of rock or a small stick, and dropping it only to enter into a steep dive and catch it in mid-air, repeating the maneuver 3 or more times.The female takes a clump of earth and drops and catches it in the same fashion.Golden eagles typically build several eyries within their territory (preferring cliffs) and use them alternately for several years.