Check out this incredible overhead view of a humpback whale surfacing through a bait ball of fish. The drone footage was captured off the coast of La Jolla, California by DolphinDoneDom.
A bait ball occurs when small fish swarm in a tightly packed spherical formation about a common centre. It is a last-ditch defensive measure adopted by small schooling fish when they are threatened by predators. Small schooling fish are eaten by many types of predators, and for this reason they are called bait fish or forage fish. [source]
