What is a bubble cloud and how do whales use them?

A bubble cloud is a technique used by whales, particularly by species like humpbacks, to trap and corral fish. Whales blow bubbles underwater to create a barrier that confuses and constrains schools of fish, making them easier to catch. This behavior is a form of cooperative hunting, often seen when whales work together to enhance their foraging efficiency. By using bubble clouds, whales can increase their chances of a successful meal.