Pachyrhinosaurus bulls fight for mating rights within the herdTo play this video you need to enable JavaScript in your browser.This video can not be playedPachyrhinosaurus bulls fight for mating rights within the herdCloseWatch the full episode on BBC iPlayer.SubsectionScience & EnvironmentPublished23 JuneShareclose panelShare pageCopy linkAbout sharingRelated topicsDinosaursFollow Dinosaursclose panelYou are now following DinosaursUpdates from your News topics will appear in My News and in a collection on the News homepage.Read description