English: Ritualized headbutting of Bolbometopon muricatum at Wake Atoll. We captured an entire headbutting bout on high definition video, consisting of four, successive charges between two males. The first three resulted in impact (∼5.8/60 s [audible but outside field of view], 19.4/60 s, 26.58/60 s), and the fourth charge resulted in the subordinate male fleeing the contest. Full sequence at normal speed. Given the distinctive sounds from headbutting, once identified, spawning grounds could be monitored with Ecological Acoustic Recorders [40] to assess reproductive effort and aid in the management of this threatened species.