Humpback whales corral entire schools of fish inside a wall of their own bubbles
A group of humpback whales will dive beneath a school of fish and swim upward in a shrinking spiral, blowing a ring of bubbles that acts as a wall the fish won't swim through. As the ring tightens, the whales surface together through the trapped, panicked shoal with mouths wide open. It's a coordinated hunting technique passed down through specific whale populations rather than performed by all humpbacks everywhere.