animal animals mammal mammals whale whales cetacea cetacean cetaceans warm blooded saltwater ocean oceanic sea water marine behaviour behavior humpback mysticeti balaenoptiidae baleen balaenoptera tail action active motion movement us usa pacific america american north america north american northern hemisphere united states maui channel auau endangered threatened tropic tropics tropical taillob taillobbing tail lob tail lobbing power powerful strength coast coastal coastline sequence pair two communication slapping pec pectoral lobbing flippers flukes