Alex Hyde / Indian moon / Indian luna moth (Actias selene) photographed on a white background. Captive.
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Edwin Giesbers / Silhouette of Black-winged stilt (Himantopus himantopus) standing on exposed rock over water, with reflections, Lesbos, Greece
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Nick Garbutt / Male Comet / Madagascar moon moth (Argema mittrei) recently emerged drying its wings. Andasibe-Mantadia National Park, Madagascar.
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Mark Carwardine / Bowhead whale (Balaena mysticetus) surfacing, showing distinctive triangular head and arched mouthline, Igloolik, Foxe Basin, Nunavut, Arctic Canada
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Bryan and Cherry Alexander / Road sign warning of Polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.
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Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.
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Bryan and Cherry Alexander / Road sign warning of polar bears, with the mountains of Adventdalen in the distance. Spitsbergen, Svalbard, Norway, June 2008.
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Juergen Freund / Juvenile batfish / spadefish (Platax sp.) against black background. North Raja Ampat, West Papua, Indonesia.
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Juergen Freund / Juvenile batfish / spadefish (Platax sp.) against black background. North Raja Ampat, West Papua, Indonesia.
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GEORGETTE DOUWMA / Eastern triangular butterflyfish (Chaetodon baronessa) feeding on coral polyps. Misool, Raja Empat, West Papua, Indonesia.
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Wild Wonders of Europe / Zupanc / The Zadlascica river flowing through Zadlascica canyon, with a triangular rock called medvedova glava (bears's head) Triglav National Park, Slovenia, June 2009
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Stephen Dalton / Triangle web spider (Hyptiotes paradoxus) waiting in freshly made triangular web, UK, Uloboridae
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GEORGETTE DOUWMA / Eastern triangular butterflyfish (Chaetodon baronessa). Raja Ampat, West Papua, Indonesia.
GEORGETTE DOUWMA / Raggy scorpionfish (Scorpaenopsis venosa) lying camouflaged on coral with a pair of Eastern triangular butterflyfish (Chaetodon baronessa) in background. Komodo, Indonesia
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PETER WARBURTON / Triangular J building, Monte Alban, the ancient centre of Zapotec culture, Oaxaca, Mexico. It is believed that the unusual angles were aligned with certain celestial events, making J building an earl...
