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Rare and endangered Australian Sea Lions (Neophoca cinerea) swim and play in the shallows of Hopkins Island, South Australia. © Michael Patrick O'Neill, National Geographic photography contest 2011

A Lions Mane Jellyfish, the largest jellyfish in the world! They have been swimming in arctic waters since before the dinosaurs (over 650 million years ago) and are among some of the oldest surviving species in the world.

HUMPBACK WHALE The humpback whale has only a single calf every one to three years. At birth, calves are between 10 and 15 feet long and weigh a ton or more. They drink about a hundred pounds of their mother's milk each day until they are weaned at about 11 months. They are fully mature when they are between four and eight years old.

KILLER WHALE Killer whales live in pods of between a few to several dozen animals. Newborn killer whales, which are about eight feet long and weigh about 400 pounds, stay very close to their mothers for about two years. An entire pod of killer whales may help care for a calf, but the bond between mother and baby is life-long.

Wild Animals: Animal Planet