15m - mass 35 to 45t. So named because of the small hump on their back. Often seen jumping out of the water and slapping their flukes and flippers either as a communication or ridding themselves of parasites or just plain having fun.
Males sing complex melodies.
They are seen from June to November during their migration between their breeding grounds off the Mozambique coast and their Antarctic feeding grounds. Some are resident off the coast all year, whilst others migrate to equatorial waters. Often seen in small groups of 5 - 6. Fast swimming, darting here and there to chase small fish. Also eat plankton.