Sue Flood / Emperor penguin (Aptenodytes forsteri) chick flapping wings, Snow Hill Island rookery, Weddell Sea, Antarctica. November.
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Sue Flood / Emperor penguin (Aptenodytes forsteri) walking with young chick at Snow Hill Island rookery, Antarctica. October.
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Sue Flood / Emperor penguins (Aptenodytes forsteri) with young chick at Snow Hill Island rookery, Antarctica. October.
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Ingo Arndt / King Penguin (Aptenodytes patagonicus) rookery crowded with nesting birds incubating eggs or protecting their small chicks, Salisbury Plain, South Georgia Island, February 2011
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Charlie Summers / Adelie Penguin (Pygoscelis adeliae) carrying stolen rock from another nest in rookery, Peterman Island, Antarctica, November.
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Marie Read / Flock of White ibis (Eudocimus albus) in breeding plumage, at rookery on water's edge of the mangrove-covered island, Tampa Bay, Florida, USA, March
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Eric Baccega / Male Steller sea lion (Eumetopias jubatus) with a group of females hauled out at a rookery, Prince Rupert, British Columbia, Canada, June.
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Floris van Breugel / Two Bull Northern Elephant Seals (Mirounga angustirostris) face off before fighting in the middle of the extensive Piedras Blancas rookery with over 150 seals just in this photo, mostly pregnant or nu...
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Diane McAllister / Great blue heron (Ardea herodias) landing with branch for its mate, who is constructing their nest on a treetop. Venice Rookery, Florida, USA, January
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Bryan and Cherry Alexander / Line of Emperor penguins (Aptenodytes forsteri) walking on sea ice. Flutter Rookery, East Antarctica.
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Sue Flood / Emperor penguin (Aptenodytes forsteri) walking across ice, Snow Hill Island rookery, Weddell Sea, Antarctica, November
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Sue Flood / Emperor penguins (Aptenodytes forsteri) one with raised flipper, Snow Hill Island rookery, Weddell Sea, Antarctica, November
