Males form these leks along streams or riverbeds during the mating season, which lasts 1–3 months. Leks consist of 20–135 males in an area about wide and long. Each male claims a display territory of about in diameter, in which he honks repeatedly and flaps his wings while hanging from a branch. Typically, 60–120 honks are produced per minute. Males display for around four hours before foraging, with peaks in lekking activity in the early evening and before dawn. The early evening peak is when the majority of copulation occurs. Females will fly through the lek, selecting a male by landing on a branch next to him. The chosen male emits a "staccato buzz" call, followed immediately by copulation, which lasts 30–60 seconds. After copulation, the female immediately departs, and the male resumes displaying. The males at the center of the lek have the most success, and are responsible for the majority of matings: the top 6% of males have 79% of the total matings. In the before-dawn peak in activity, copulation is less frequent, and males spend time jockeying with each other for the best display territory. As the mating season progresses, the importance of the before-dawn peak lessens.