Aflo / Japanese flying squirrel (Petaurista leucogenys) in tree hole, Kyoto, Japan. March.
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Jussi Murtosaari / White-backed woodpecker (Dendrocopos leucotos) male on heavily drilled tree, Laukaa, Keski-Suomi, Lansi- ja Sisa-Suomi / Central and Western Finland, Finland. February
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Rhonda Klevansky / Hole in the salt pan of Salar de Uyuni, the worlds biggest salt pan, Bolivian Altiplano, Bolivia. February 2009.
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Rhonda Klevansky / Tourist standing by hole in Salar de Uyuni, the worlds largest salt pan, Altiplano, Bolivia. February 2009.
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David Noton / Dawn over the mountains and Nam Song River at Vang Vieng, Laos, March 2009.
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Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
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Olga Kamenskaya / People looking at hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April 2009.
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Olga Kamenskaya / Hole in ice used by Baikal seals (Pusa sibirica) for breathing. Lake Baikal, Russia, April.
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Olga Kamenskaya / Holes in ice used by Baikal seals (Pusa sibirica). Lake Baikal, Russia, April 2009.
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Olga Kamenskaya / Man visible on surface of the ice through dive hole. Lake Baikal, Russia. March 2008.
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Pal Hermansen / View to wintry landscape through hole in ice, Hornsund, Svalbard, Norway, September.
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Philippe Clement / European pine marten (Martes martes) emerging from its nest hole in a tree in autumn, Bayerischer Wald / Bavarian Forest National Park, Germany, October. Captive. Digital composite.
