animal back canada cetacean dive fin hump humpback mammal marine Megaptera novaeangliae natural nature ocean ridge sea water whale tail big blowhole carbuncle danger enormous giant huge jaw large surface tubercle Vancouver Island appearance beak beaks blood-flow captive captivity Chinese-white-dolphin clever coastal-animals color coloration colored colorful colors colour coloured colourful colours confined conservation contrast contrasting dark-spots entertaining entertainment environment environmental Indo-Pacific-humpbacked-dolphin marine-park medium-sized near-threatened oceanic perfoming performance pink pink-dolphins restricted skin Sousa-chinensis spots spotted teeth wild wildlife