The Sardine Run

  The sardine run is the annual migration of sardines which attracts sharks, dolphins and even whales from all over the place. Nobody knows exactly what causes this mass-migration-massacre, but a popular theory is that yearly changes in water temperature where the sardines normally live on the coast of Mozambique cause the migration to South Africa's warmer waters.
  The sharks whose presence has been recorded at these frantic all-you-can-eat-buffets consist of dusky sharks, bronze whaler sharks, blacktip sharks (not to be confused with blacktip reef sharks), sand tiger sharks, spinner sharks, Zambezi sharks, great white sharks and occasionally thresher sharks. These are accompanied by common and bottlenose dolphins, Cape fur seals, gannets, turns, cormorants, African penguins and whales of all description. The sardines, when faced with such predators, group into tight shoals to form 'bait balls'.
  The following videos have caught the stunning events in perfect light.
http://www.bbc.co.uk/programmes/p004j1rz
https://www.youtube.com/watch?v=0qtvk9znnnY

The sharks snap up the sardines.

A sailfish darts through the bait ball.

The bottlenose dolphins round up the floundering fish from beneath.