Savage Island Giants

Halfway between New Zealand and Antarctica the rugged Auckland Islands, are a haven of life in the southern ocean. Every summer a huge congregation of New Zealand sea lions arrives, and brawling males battle for mating rights, while females give birth. Beneath the waves, male giant spider crabs migrate from the depths to the coast to perform their bizarre breeding ritual, while yellow-eyed penguins must adapt if they are to survive the summer. (National Geographic)