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...

Stephen Dalton / Giant sailfin dragon lizard {Hydrosaurus amboinensis} running over the surface of water, controlled conditions, from Indonesia

Paul Hobson / Sanderling (Calidris alba) on beach, Lincolnshire, UK

Rolf Nussbaumer / Sanderling running along beach {Calidris alba} Sanibel Is, Florida, USA

Claudio Contreras / Greater roadrunner (Geococcyx californianus) running, Laredo Borderlands, Texas, USA. April

Bryan and Cherry Alexander / Bands of sorted stones running downhill, caused by frost and solifluction. Hurry Inlet, East Greenland, September 2005.

Bryan and Cherry Alexander / Line of boulders, sorted into a line by the action of the frost over many years. Dombrava River Valley. Hurry Inlet, East Greenland, September 2005.

Bryan and Cherry Alexander / Light catches an area of solifluction and erosion in the Dombrava River Valley. Hurry Inlet, Scoresbysund, East Greenland, September 2005.

Bryan and Cherry Alexander / Reindeer lichen (Cladonia sp.) and the autumn russet catkins of Dwarf birch (Betula nana) on the tundra in Hurry Inlet. Scoresbysund, East Greenland, September.

Jenny E. Ross / Sunset in a small fjord within Scoresby Sund, dotted with icebergs and bordered by fog-shrouded mountains covered with snow. Hurry Inlet, Scoresby Sund, East Greenland.

Anup Shah / Common zebras {Equus quagga} swimming through Mara Mara River with Wildebeest. Kenya