Great cormorant (Phalacrocorax carbo) chasing school of fish ( bait ball ) on Spanish Balearic island of Majorca / Spain - 4K stock video

The great cormorant (Phalacrocorax carbo), known as the black shag in New Zealand and formerly also known as the great black cormorant across the Northern Hemisphere, the black cormorant in Australia, and the large cormorant in India, is a widespread member of the cormorant family of seabirds. 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.