You slip over the side of your boat, descending deep into the dark realm of the Earth's largest creature. Then the whale starts to sing, just feet away from you. You record the sounds, hoping one day to understand their language. Their music is a rare glimpse of this majestic mammal's unknown world. Photographer Flip Nicklin brings you face to face with whales as they communicate, nurse their young, and surface dramatically for air. Meet these intelligent, social creatures in their natural habitat; learn of the different kinds of whales, from humpbacks to belugas; discover how we can aid their recovery from years of overhunting; and how we can protect their environment.  (BST117, $16.95)