In this technique, which is unique to humpback whales, the animals exhale through their blowholes while swimming in a tightening spiral so as to create a cylindrical wall of bubbles under the water. The wall of bubbles acts as a net that fish are reluctant to swim through. The whales then suddenly swim upwards through the bubble net, mouths agape, swallowing thousands of fish in each gulp. This technique can involve a ring of bubbles up to 30 m (100 ft) in diameter and the cooperation of a dozen animals. Some whales take the task of blowing the bubbles, some dive deeper to drive fish towards the surface, and others herd fish into the net by vocalizing.
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