Bence Mate / Green / Double-crested basilisk (Basiliscus plumifrons) running across water surface, Santa Rita, Costa Rica. Did you know? This amazing lizard is colloquially known as the 'Jesus Christ lizard' for i...

Richard Du Toit / Greater Double-collared Sunbird (Nectarinia afra) male on Pincushion (Leucospermum sp) flower, Western Cape, South Africa

Tony Wu / Humphead parrotfish (Bolbometopon muricatum) shoal spawning in early morning, part of mass aggregation of thousands of fish. Caroline Islands, Palau.

Gary Bell/ Oceanwide / Painted Sweetlips (Diagramma pictum) in Slender Cardinalfish (Rhabdamia gracilis) school near Double-headed Maori Wrasse (Cheilinus undulatus), Great Barrier Reef, Australia

Gary Bell/ Oceanwide / Double-headed Maori Wrasse (Cheilinus undulatus), Painted Sweetlips (Diagramma pictum), and Slender Cardinalfish (Rhabdamia gracilis) school, Great Barrier Reef, Queensland, Australia

Jeff Foott / Double Arch seen through Cove Arch, Arches National Park, Utah

Jeff Foott / Double O Arch, Arches National Park, Utah

Ingo Arndt / Double-crested cormorant (Phalacrocorax auritus) adult resting, close up portrait, Everglades National Park, Florida, USA. January. Finalist in the Birds Category of the GDT Awards 2015.

Ingo Arndt / Close up foot of Double crested basilisk {Basiliscus plumifrons}

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Tim Fitzharris / The Windows Section from Double Arch at sunrise, Arches National Park, Utah

Bence Mate / Green / Double-crested basilisk (Basiliscus plumifrons) running across water surface, Santa Rita, Costa Rica.