How orcas hunt sharks in South Africa
In the waters off South Africa, a struggle for power is raging between two apex predators - orcas and great white sharks. Great white sharks began washing ashore soon after male orcas moved into the fishing town of Gaansbaai in the Western Cape. Marine biologist Dr Alison Towner tells Newsday's Lawrence Pollard about the clues she has found from the dead sharks.
(Photo: A great white shark Credit: Getty Images)