To help ensure the survival of endangered whooping cranes, Operation Migration maintains an artificial breeding program that prepares chicks for adulthood.

Rarely seen aspects of shark behavior highlight this extraordinary view of undersea life, including an organized feeding frenzy with other predators that help herd their prey; night hunting in packs; and their violent courtship ritual. Also: the red-lipped batfish, which “walks” on the ocean floor via modified fins.