Extras

    Video thumbnail: Nature Ocean Giants: Deep Thinkers

    Nature

    Ocean Giants: Deep Thinkers

    Airs Wednesday, April 4, 2012 at 8:00 p.m. ET/PT. Check your local listings.

    Ocean Giants: Deep Thinkers

    Video thumbnail: Nature Dolphin Mud Walls

    Nature

    Dolphin Mud Walls

    In Florida Bay, dolphins feed by creating walls of mud that trap nearby fish.

    Dolphin Mud Walls

    Video thumbnail: Nature Dolphin Bubble Play

    Nature

    Dolphin Bubble Play

    What will dolphins make of the silvery rings of air produced by a bubble machine?

    Dolphin Bubble Play