Stefan Christmann / Emperor penguin (Aptenodytes forsteri), two chicks aged six to eight weeks huddling together. Atka Bay, Antarctica. September.
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Emanuele Biggi / Peruvian Tarantula (Pamphobeteus sp.) and Humming Frog (Chiasmocleis royi) together, Los Amigos Biological Station, Madre de Dios, Amazonia, Peru. These species have a commensal relationship. The tara...
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Jack Dykinga / Burrowing owl (Athene cunicularia), two huddled together. Marana, Pima County, Arizona, USA.
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Cyril Ruoso / Long-tailed macaques (Macaca fascicularis) two juveniles sitting close together. Koram island, Khao Sam Roi Yot National Park, Thailand.
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David Fleetham / Philippine reef scene with butterflyfish. Balicasag Island is a flat island four kilometers southwest of Duljo Point off what is known as Pangalo Reef in the Philippines. (Four photographs were digita...
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Fiona Rogers / Eastern chimpanzee (Pan troglodytes schweinfurtheii) juvenile female 'Fadhila' aged 5 years and her brother 'Fifty' aged 3 years playing together.Gombe National Park, Tanzania.
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Solvin Zankl / Bioluminescent Sea-fireflies (Vargula hilgendorfii) producing a bright blue light. The light is produced by mixing two chemicals together in the presence of oxygen and is for mating displays or defenc...
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Claudio Contreras / Silky shark (Carcharhinus falciformis) two swimming together, Jardines de la Reina / Gardens of the Queen National Park, Caribbean Sea, Ciego de Avila, Cuba, January. Vulnerable species.
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Theo Bosboom / Banded demoiselles (Calopteryx splendens) pair still clasped together after mating, with two males resting nearby, the Netherlands, July.
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Jussi Murtosaari / Blackcap (Sylvia atricapilla) female and two males huddling together for warmth while sleeping, Finland, May.
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Frederique Olivier / Close-up of a group of Emperor penguin (Aptenodytes forsteri) chicks huddled together in a blizzard, covered in snow, Adelie Land, Antarctica, January.
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Frederique Olivier / Emperor penguin (Aptenodytes forsteri) chicks huddled together during a blizzard, Adelie Land, Antarctica, January.
