圍觀座頭鯨獵食1 Hints： Humpback whales krill bubble

Humpback whales. During the brief summer they gorge themselves on krill. When the krill swarms are near the surface, the humpbacks collect them by lunging. They simply open their cavernous mouths and scoop it up. Often the whales cooperate, working together as fishing boats do. When the krill is more dispersed, the whales have to dive deeper. After a while, lines of bubbles appear on the surface. The bubbles gradually form a pattern that spirals inwards, then suddenly in its center, the whales appear.

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