Bert Willaert / Titicaca water frog (Telmatobius culeus) swimming underwater, Lake Titicaca, Bolivia. Critically endangered species.
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Alex Hyde / Sheetweb weaving spider (Linyphiidae) in web at sunset. The silk is refracting the light into a rainbow of coloured bands. Slovenia, July.
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Staffan Widstrand / King eider duck (Somateria spectabilis) male, Batsfjord village harbour, Varanger Peninsula, Norway.
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George Sanker / North American river otter (Lontra canadensis) two in water with autumnal trees reflected in the water, Acadia National Park, Maine, USA, October.
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Tui De Roy / White-vented storm petrel (Oceanites gracilis galapagoensis) 'walking' on surface of water whilst foraging, Galapagos
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George Sanker / North American River Otter (Lontra canadensis) two swimming near the surface with autumn leaves reflected in water, Acadia National Park, Maine, USA, October.
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Pascal Kobeh / Sicklefin lemon shark (Negaprion acutidens) in the lagoon of Picard Island, Aldabra, Seychelles, Indian Ocean.
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Olga Kamenskaya / Transparent ice formation on Lake Baikal, Siberia, Russia, March 2012.
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Olga Kamenskaya / Pyramidal ice fragment reflected on the surface of Lake Baikal. Ice fragment acting as a prism refracting light into rainbow. Siberia, Russia, March.
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Chris & Monique Fallows / Common dolphin (Dephinus delphis) porpoising, False Bay, Cape Town, South Africa.
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Theo Bosboom,Theo Bosboom / Common blue damselflies (Enallagma cyathigerum) flying over water, in a fen Hondeven, east Holland, June
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Felicity Lanchester,Felicity Lanchester / Cloud iridescence forming above a cumulonimbus cloud, caused by light refraction through individual water droplets and ice crystals at high altitude, Sierra Leone.