Orca calves are born at any time of year, although winter is the most common. Day-to-day behaviour generally consists of foraging, travelling, resting and socializing. Orca, or killer whales, frequently engage in surface behaviour such as breaching (jumping completely out of the water) and tail-slapping. These activities may have a variety of purposes, such as courtship, communication, dislodging parasites, or play. Spyhopping is a behaviour in which a whale holds its head above water to view its surroundings. Resident killer whales swim alongside porpoises, other dolphins, seals, and sea lions, which are common prey for transient killer whales.
The heart beats at a rate of about 60 beats/min when the orca is at the surface, dropping to 30 beats/min when submerged.