Sven Zacek / Cross-country skiier on a moonlit night admiring the Northern Lights (Aurora borealis), Norway, March 2013.
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Richard Du Toit / Black wildebeest (Connochaetus gnou) bull silhouetted at dawn, Rietvlei Nature Reserve, Gauteng Province, South Africa.
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Steven Kazlowski / Photographer in front of Northern lights / Aurora borealis glowing brightly over the frozen eastern Beaufort Sea, Arctic National Wildlife Refuge, Alaska Model released.
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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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David Pattyn / Great crested grebe (Podiceps cristatus) pair with crest erect during courtship dance, The Netherlands. March.
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Staffan Widstrand / RF- European hedgehog (Erinaceus europaeus) orphan, Jarfalla, Sweden. August. (This image may be licensed either as rights managed or royalty free.)
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Inaki Relanzon / Photographer taking photos of rock formations, silhouetted at sunset on the Pacific coast of Olympic National Park, Washington State, USA. Model released.
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Bert Willaert / Girl holding Southern hawker (Aeshna cyanea) by the wings, Slovenia. September 2006. Model released.
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Bert Willaert / Girl holding Southern hawker (Aeshna cyanea) by the wings, Slovenia. September 2006. Model released.
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Enrique Lopez-Tapia / Man in open rowboat at dusk, Orango Island, Guinea-Bissau, December 2013.
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Doug Gimesy / CEO of the Australian Conservation Foundation (ACF) Kelly O'Shanassy, paddling down the Yarra River, Melbourne, watching a colony of Grey-headed Flying foxes (Pteropus poliocephalus) that now liv...
