Our guest this week, the New England Aquarium’s penguin expert, Dyan deNapoli, “The Penguin Lady,” talks about her new book “The Great Penguin Rescue” with important lessons – and hope – for the desperate penguin rescue and rehabilitation efforts underway following the tragic oil spill at Nightingale Island in the South Atlantic. Also: An update on the rescue effort from Tristan da Cunha by Katrine Herian of the Royal Society for the Protection of Birds.