Elephant seals migrate to the Falklands, sub-Antarctic islands circled by relentless ocean winds and currents, to breed. The youngsters receive careful attention from their mothers.
Going to sea on the Antarctic Peninsula, Gentoo penguins line up and quickly dive in together.
To the walrus, ice is life. An oxygen-breathing marine mammal, it relies on the ice as a place to rest, to give birth, to nurse and to migrate. And with global warming, the ice is disappearing. Their annual migration is becoming a race against time and distance, depth and disaster.
A male wandering albatross displays its 11-foot wingspan to a female on South Georgia Island. The courtship ritual renews their pair bond after months of roaming the Southern Ocean.
Bellowing elephant seal bulls - weighing up to four tons and as much as 15 feet long - are doing more than boasting. Their battles are often vicious, and opponents may be severely injured. The top winner becomes the colony's "beachmaster."
Bald eagles migrate along the Mississippi corridor in the spring, toward breeding grounds in the northern United States and Canada, finding plentiful food resources, and sometimes joined in feasting by common ravens.