Along South Africa's east coast, the right combination of winter weather and ocean currents trigger the sardine run, one of the most impressive events in the world's oceans. In recent years, the sardine run has become less predictable, for reasons which are still unclear, bringing into jeopardy an entire food chain which it supports. The fourth programme follows the largest gathering of predators on the planet as they hunt down billions of sardines pinned to the cold water along the coast. They include Cape gannets, which time their breeding to coincide with the arrival of the huge sardine shoals. They are filmed at their breeding colony on Bird Island and in super slow motion breaking the surface on their plunge dives. In the water, a super-pod of 5,000 common dolphins also hunts down the sardines. A 15-mile long shoal is located by the predators, and the ensuing feeding frenzy is filmed from the air, the surface and underwater. Dolphins herd the sardines into the shallows, where they come within reach of the diving gannets. Thousands of sharks arrive to join the attack, but the largest predator of all is the lunging Bryde's whale. "Life on the Run" follows the fortunes of the film crew as they track the hunters. In 2007, the sardine run didn't happen at all, but their patience was rewarded the following year.
Nature's Great Events is a wildlife documentary series made for BBC television, first shown in the UK on BBC One and BBC HD in February 2009. The series looks at how seasonal changes powered by the sun cause shifting weather patterns and ocean currents, which in turn create the conditions for some of the planet’s most spectacular wildlife events. Each episode focuses on the challenges and opportunities these changes present to a few key species. Nature's Great Events was produced by the BBC Natural History Unit in association with the Discovery Channel and Wanda Films. The British version of the series was narrated by David Attenborough. In the USA, the series was shown under the alternative title Nature's Most Amazing Events beginning on 29 May 2009 and was narrated by Hasani Issa. The title Nature's Great Events was previously used by Reader's Digest for a unrelated VHS series released in 1996. Source