Rare video captures following and biting courtship behavior in elusive whale sharks / Surfer attacked by two great white sharks says nearly being eaten alive 'improved life' / Unique killer whale pod may have acquired special skills to hunt whale sharks / Sharks leap out of the water more often than you might think / Study examines how sharks are being impacted by a changing ecosystem / Dramatic moment bull shark tries taking fisherman's catch / Bull sharks 'more abundant' in Sydney Harbour during summer and autumn / Resting gray reef sharks change what we know about how they breathe