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. Photographer Flip Nicklin brings you face to face with whales as they communicate, nurse their young, and surface dramatically for air.

Learn of the different kinds of whales, discover how we can aid their recovery from years of overhunting, and how we can protect their environment.