Cetacean surfacing behaviour is a group of unique behaviours demonstrated by the Cetacea order when they come to the water's surface to breathe. Time intervals between surfacing can vary depending on the species, surfacing style or the purpose of the dive, and some species have been known to dive for up to 85 minutes at a time when hunting. In addition to respiration, cetaceans have developed and use surface behaviours for many other functions such as display, feeding and communication.