When a whale thus leaps his whole length out of the water, the sailors say he "breaches", and breaching is a common practice.

They seem to do it often for amusement as well as from terror.
But the most deadly of the three enemies is the killer.

This is itself a kind of small whale, but it is wonderfully strong, swift, and bold.
When one of the killers gets into the middle of a school of whales, the frightened creatures are seen flying in all directions.

His mode of attack is to seize his big enemy by the jaw, and hold on until he is exhausted and dies..