Cetacean surfacing behaviourCetacean surfacing behaviour is a grouping of movement types that cetaceans make at the water's surface in addition to breathing. Cetaceans have developed and use surface behaviours for many functions such as display, feeding and communication. All regularly observed members of the order Cetacea, including whales, dolphins and porpoises, show a range of surfacing behaviours. Cetacea is usually split into two suborders, Odontoceti and Mysticeti, based on the presence of teeth or baleen plates in adults respectively.
Bait ballA bait ball, or baitball, occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators. Small schooling fish are eaten by many types of predators, and for this reason they are called bait fish or forage fish. For example, sardines group together when they are threatened. This instinctual behaviour is a defence mechanism, as lone individuals are more likely to be eaten than an individual in a large group.
TursiopsLe Tursiops est un genre animal de la famille des cétacés. Ils sont communément appelés « dauphins à gros nez ». Ce genre comprend trois espèces : Tursiops aduncus (Ehrenberg, 1833) — grand dauphin de l'océan Indien Tursiops truncatus (Montagu, 1821) — grand dauphin Tursiops truncatus ponticus Tursiops truncatus truncatus Tursiops australis (Charlton-Robb et al., 2011) — dauphin Burrunan Fichier:Migrating mammals (15346028265).jpg|''[[Tursiops aduncus]]'' Fichier:Burrunan Dolphin (Tursiops australis)-B.
