Kevin Schafer / Gentoo Penguin (Pygoscelis papua) parent with chicks, Pleneau Island, Antarctic Peninsula, Antarctica

Kevin Schafer / Gentoo Penguin (Pygoscelis papua) male bringing stones to female with chicks, Pleneau Island, Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists on a zodiac going past icebergs in Iceberg Alley, Pleneau Island, Antarctica

Bryan and Cherry Alexander / Zodiac filled with tourists seen through ice arch in an iceberg, Pleneau Island, Antarctica, February 2009.

Brent Stephenson / Crabeater Seal (Lobodon carcinophaga) hauled out on ice. Pleneau Island, Antarctica, January.

Bryan and Cherry Alexander / Pointed iceberg seen through a hole in an iceberg near Pleneau Island, Antarctic Peninsula, Antarctica.

Enrique Lopez-Tapia / DUPLICATE DELETE Icebergs with holes in the ice, Iceberg Alley, Pleneau Island, Antarctica.

Enrique Lopez-Tapia,Enrique Lopez-Tapia / Icebergs in Iceberg Alley, Pleneau Island, Antarctica.

Enrique Lopez-Tapia / Blue iceberg in Iceberg Alley, Pleneau Island. Antarctica.

Brent Stephenson / Windows in an iceberg at the 'iceberg graveyard'. Near Pleneau Island, Antarctic Peninsula, Antarctica, January.

Brent Stephenson / Crabeater Seals (Lobodon carcinophaga) swimming near an iceberg. Pleneau Island, Antarctic Peninsula, Antarctica, January.

Bryan and Cherry Alexander / Tourist zodiac is dwarfed by the huge icebergs near Pleneau Island, Antarctic Peninsula.