When a humpback whale breaches, he essentially jumps out of the water and whirls around -- often numerous times in a row, but sometimes merely once.
The precise motives behind humpback whale breaching behavior are uncertain, according to the Whale Trust organization. However, a variety of different theories on the action do exist. One such theory is the transmission of messages. A humpback whale might, for example, want to convey to a fellow whale that he's planning on changing his course.
Breaching in humpback whales also could be a territorial action, suggests the Petersburg Marine Mammal Center. If a wary humpback whale senses an approaching intrusion or menace, he might attempt to intimidate them away from his personal turf by breaching.
Breaching could also be a standard cleanliness routine, nothing more and nothing less. By breaching, a humpback whale could simply be using motion to remove any pesky parasites that could be residing on his body.
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