South Africa's annual Sardine Run has been dubbed 'The Greatest Shoal on Earth'. This piscine spectacle occurs annually when millions of southern African pilchards follow a cold current northwards along the coast. An array of predators, including dolphins, sharks and gannets, take advantage of the abundant food supply and show up in their droves to feast on the silvery shoals.

Dolphins will typically split the shoals into smaller tightly packed clusters (known as baitballs) before the other predators move in to feed. Filming under these conditions can be very challenging, and camera operators are often bumped or knocked as they try to capture that perfect shot in the thick of the fast-moving action. www.earth-touch.com