David Shale / Hydromedusa/ Trachymedusa (Crossota sp) from approx 2700m, mid Atlantic ridge, June 2010

David Shale / Fang Tooth {Anoplogaster cornuta} close-up of head showing teeth, from the Mid-Atlantic Ridge, 2600m

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in blizzard. Svalbard, Norway. April.

Danny Green / Reindeer (Rangifer tarandus), two standing on ridge in snow. Svalbard, Norway, April.

Danny Green / Reindeer (Rangifer tarandus) standing on ridge in snow, another reindeer in background. Svalbard, Norway, April.

David Woodfall / Little tern (Sterna albifrons) nest with three eggs in shingle ridge. County Wicklow, Republic of Ireland, June.

Daniel J. Cox / Gray Wolf (Canis lupus) pack on ridge in winter, Lamar Valley, Yellowstone National Park, Wyoming

Tui De Roy / Volcan Alcedo Giant Tortoise (Chelonoidis nigra vandenburghi) on ridge, Alcedo Volcano, Isabela Island, Galapagos Islands, Ecuador

Tim Fitzharris / Syncline Ridge and Miette Range from Moberly Flats, Jasper National Park, Alberta, Canada

Tim Fitzharris / Syncline Ridge and Miette Range from Moberly Flats, Jasper National Park, Alberta, Canada

SCOTLAND: The Big Picture / Timelapse of Old Man of Storr in winter, Trotternish Ridge, Isle of Skye, Inner Hebrides, Scotland, UK, March 2014.

David Shale / Pram bug (Phronima) swimming, Mid-Atlantic Ridge. Deep sea species.