Stefan Christmann / Orca (Orcinus orca), two spyhopping in gap in sea ice. Atka Bay, Antarctica. January.

Franco Banfi / Sugar kelp (Saccharina latissima) near iceberg, view upwards to gap in sea ice. Tasiilaq, East Greenland. April.

Guy Edwardes / Aurora Borealis over Sycamore Gap, Hadrian's Wall, Northumberland, England. February 2014

Floris van Breugel / Zebra Slot Canyon, Escalante National Monument, Utah, USA, November 2010.

David Tipling / Grassland and forest at 9,000 feet, at Tari Gap, Highlands, Papua New Guinea, August 2011

Nick Garbutt / Silhouette of Red-fronted brown lemur (Eulemur rufus) leaping across gap in trees by moonlight, cathemeral behaviour, Ranomafana National Park, south east Madagascar, November

Kirkendall-Spring / Canopy of autumn trees and rising fog viewed from Webb Overlook along the Newfound Gap Road in Great Smoky Mountains National Park, North Carolina, USA, October 2008

John MacPherson / 2020VISION / Bottlenose dolphin (Tursiops truncatus) two breaching in evening light, Moray Firth, Inverness-shire, Scotland, UK, August, sequence 2/2. Photographer quote: 'A day of overcast cloud cleared in the la...

Stephen Dalton / Barn swallow (Hirundo rustica) flying through gap in stable door, UK

Wild Wonders of Europe / Zupanc / River Lepenjica flowing through narrow gap in rocks, Triglav National Park, Slovenia, June 2009

Jerry Monkman / A young brother and sister holding hands while hiking on Gap Mountain, Troy, New Hampshire, USA. Mount Monadnock is in the distance. Model Released. August 2008

Warwick Sloss / Male Red kangaroo {Macropus rufus} feeding, Fowlers Gap Research Station, New south wales, Australia