A remarkable video has emerged from South Africa of dolphins, sea birds and sharks competing to feed on migrating sardines.<br /><br />The video shows dolphins blowing bubbles to herd the sardines together and then feed on the fish. <br /><br />Meanwhile, gannets rain down from the sky at speeds of 100 kilometres per hour and dive under the water trying pick off sardines.<br /><br />Sharks approach from all sides, themselves trying to make the most of the rapidly diminishing bait ball.<br /><br />The astonishing clip was filmed on June 2 north of East London.
