Carol Walker / Cowboy riding in snow throwing a loop, Flitner Ranch, Shell, Wyoming, USA

Carol Walker / Silhouette of cowboy trotting, swinging a loop at sunset, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy riding in snow throwing a loop, Flitner Ranch, Shell, Wyoming, USA Model released

Kirkendall-Spring / View overlooking the badlands from Scenic Loop Drive, Theodore Roosevelt NP, North Dakota, USA

Solvin Zankl / Seed heads of European groovebur (Agrimonia eupatoria) Europe. Burs on the seeds enable hook-and-loop connections between the seed and animal fur or peoples clothes, thus ensuring seed dispersal.

Tim MacMillan / John Downer Pr / Multiple exposure of flying Paradise tree snake showing how it forms a loop for maximum thrust as it lauches itself into air (Resolution restriction - image digitised from film, 'Weird Nature' tv seri...

Jiri Lochman / Little long-tailed dunnart (Sminthopsis dolichura) Useless Loop, Shark Bay, Western Australia - October.

Duncan Murrell / Batak man making a loop from rattan for a tree-climbing aid in Cleopatras Needle Critical Habitat, Palawan, the Philippines. September 2016.

Duncan Murrell / Batak man preparing a rattan loop for a tree-climbing aid in Cleopatras Needle Critical Habitat, Palawan, the Philippines. September 2016.

Kirkendall-Spring / Forest along the Spruce Loop in the Hoh Rain Forest, Olympic National Park, Washington, USA, April.

Kirkendall-Spring / Trees growing from the root ball of a fallen tree, Spruce Loop in the Hoh Rain Forest, Olympic National Park, Washington, USA, April.

Kirkendall-Spring / Row of trees which have grown from a fallen nurse log, Spruce Loop, Hoh Rain Forest of Olympic National Park, Washington, USA, April.

Karine Aigner / Nano transmitter for songbirds, with loop harness. Block island, Rhode Island, USA.

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Ashley Cooper / Old house at Recherchefjorden, Van Keulenfjorden, Spitsbergen, Svalbard. It is gradually sliding down slope due to solifluction and permafrost melt. Norway, July 2013.

Kirkendall-Spring / Young trees growing in the root ball of a fallen tree along the Spruce Loop, Hoh Rain Forest, Olympic National Park, Washington, USA, April.

Kirkendall-Spring / Crashing surf on the cliffs of Cape Kiwanda State Park along the the Three Capes Scenic Loop. Oregon, USA. March 2018.

Kirkendall-Spring / Crashing surf on the cliffs of Cape Kiwanda State Park along the the Three Capes Scenic Loop. Oregon, USA. March 2018.

Kirkendall-Spring / Frost covered trees with fog near Loop Loop Summit in the North Cascades. Washington, USA. January 2018.

Kirkendall-Spring / Frost covered trees with fog near Loop Loop Summit in the North Cascades. Washington, USA. January 2018.

Kirkendall-Spring / Devils Tower viewed from the Joyner Ridge Loop Trail in Devils Tower National Monument, Wyoming, USA. September 2016.

Kirkendall-Spring / Devils Tower viewed from the Joyner Ridge Loop Trail in Devils Tower National Monument, Wyoming, USA. September 2016.

Kirkendall-Spring / Devils Tower viewed from the Joyner Ridge Loop Trail in Devils Tower National Monument, Wyoming, USA. September 2016.

Kirkendall-Spring / Devils Tower viewed from the Joyner Ridge Loop Trail in Devils Tower National Monument, Wyoming, USA. September 2016.

Mike Read / Terrace Springs hot pools in the Maddison River Valley, Grand Loop Road, Yellowstone National Park, Wyoming, USA. June 2015

Mike Read / Approaching rain over grassland near Blacktail Deer Creek, beside the Grand Loop Road, Yellowstone National Park, Wyoming, USA, June 2015.

Mike Read / Undine Falls Gardiner river, The Grand Loop Road, Yellowstone National Park, Wyoming, USA, June 2015.

Mike Read / Undine Falls Gardiner river, The Grand Loop Road, Yellowstone National Park, Wyoming, USA, June 2015.

Mike Read / Glacier lily (Erythronium grandiflorum) The Grand Loop, Yellowstone National Park, Wyoming, USA June

Mike Read / Glacier lily (Erythronium grandiflorum) The Grand Loop, Yellowstone National Park, Wyoming, USA June

Mike Read / Glacier lily (Erythronium grandiflorum) mass at woodland edge, The Grand Loop, Yellowstone National Park, Wyoming USA June

Mike Read / White bog orchid (Platanthera dilatata) The Grand Loop, Yellowstone National Park, Wyoming, USA June

Mike Read / Alpine paintbrush (Castelleja rhexifolia) among grasses at roadside, The Grand Loop, Yellowstone National Park, Wyoming USA June

Mike Read / Narrowleaf bluebells (Mertensia lanceolata) in alpine meadow near Mount Washburn, The Grand Loop, Yellowstone National Park, Wyoming USA June

Mike Read / Alpine meadow near Mount Washburn, The Grand Loop, Yellowstone National Park, Wyoming USA June

Mike Read / Sulphur paintbrush (Castilleja sulphurea) in alpine meadow near Mount Washburn, The Grand Loop Yellowstone National Park, Wyoming, USA June

Kirkendall-Spring / View of Corteo Peak and Black Peak, Maple Pass Loop, North Cascades National Park Complex, Washington, USA. October 2015.

Michael Pitts / Giant manta ray (Manta birostris) swimming in a loop at night, Maldives, Indian Ocean.

Kirkendall-Spring / Feet of hiker on the Moore's Wall Loop part of the Mountain-to-Sea Trail in hanging Rock State Park. North Carolina, USA, October 2013.

MYN / Carsten Krieger / Coastal landscape at Loop Head at low tide, Ross, County Clare, Republic of Ireland, June 2013. Meetyourneighbours.net project

MYN / Carsten Krieger / Coastal landscape at Loop Head at spring tide, Ross, County Clare, Republic of Ireland, June 2013. Meetyourneighbours.net project

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / The spectacular Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine fir and larch trees, North Cascades National Park...

Konstantin Mikhailov / The spectacular Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine firs and larches, North Cascades National Park Cas...

Konstantin Mikhailov / The rocky highlands of North Cascades Range above the tree line in clouds on Maple-Loop Trail in Rainy Pass area, North Cascades National Park, Cascade Range, Washington, October 2009.

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / View to Mt.Logan Ridge in low clouds from the Maple-Loop Trail in Rainy Pass area of North Cascades National Park, Cascade Range, Washington, USA, October 2009.

Konstantin Mikhailov / The Loop-Maple Trail heading up from Rainy Pass area of North Cascades Scenic Highway, above the tree line, with the islets of sub alpine firs and larches, North Cascades National Park Cascade Range,...

Konstantin Mikhailov / The rocky highlands of North Cascades Range above the tree line in clouds, on Maple-Loop Trail in Rainy Pass area, North Cascades National Park, Cascade Range, Washington, October 2009.

Kirkendall-Spring / Person hiking along the Burroughs Loop Trail near Sunrise in Mount Rainier National Park, Washington, USA, August 2009

Kirkendall-Spring / Person hiking along the Burroughs Loop Trail near Sunrise in Mount Rainier National Park. Washington, USA, August 2009, model released

LYNN M. STONE / Woman riding Arabian Horse in field, bareback and guiding it only with neck loop, Northern California, USA (Model Released)

Robert Thompson / Coastline near Loop Head, Kilcloher Cross, County Clare, Republic of Ireland, March 2009

Carol Walker / Cowboy making a loop while riding in snow, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Silhouette of cowboy trotting, swinging a loop at sunset, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy riding in snow, ready to throw a loop, Flitner Ranch, Shell, Wyoming, USA Model released

Carol Walker / Cowboy swinging a loop on Quarter horse running in the snow at Flitner Ranch, Shell, Wyoming, USA Model released

Jerry Monkman / Mountain Biking on Providence Pond Loop Trail, White Mountains, Chatham, New Hampshire, USA

Carol Walker / Cowboy galloping on horse while swinging a loop / lassoo, Flitner Ranch, Shell, Wyoming, USA, model released

Pete Oxford / Steamboat Geyser along Back Basin loop, Yellowstone National Park, Wyoming

Kirkendall-Spring / View of the sunrise over prairies on Scenic Loop Drive, Theodore Roosevelt NP, North Dakota, USA

Jane Burton / Caterpillar (unidentified) Kenya, Africa.

Fred Bavendam / Horseshoe Crab (Limulus polyphemus) makes a loop in the sand while crawling back to the water after spawning, Cape May, New Jersey

Martin Gabriel / 'The Loop', Murchison river, Kalbarri NP, Western Australia

Kirkendall-Spring / Ferns and moss covered trees along the Quinault Nature Loop Trail in the Quinault River Valley, Olympic National Park, Washington, USA. June.

Kirkendall-Spring / Ferns and moss covered trees along the Quinault Nature Loop Trail in the Quinault River Valley, Olympic National Park, Washington, USA. June.

Kirkendall-Spring / The 'Door' and 'Window' rock formations along the Badlands Loop Road, Badlands National Park, South Dakota, USA. June, 2022.

Kirkendall-Spring / Car travelling along Badlands Loop Road under dark storm clouds, Badlands National Park, South Dakota, USA. June, 2022

Kirkendall-Spring / Buttes along the Badlands Loop Road, Badlands National Park, South Dakota, USA. June, 2022.

Kirkendall-Spring / Sunrise over the 'Door' and 'Window' rock formations along the Badlands Loop Road, Badlands National Park, South Dakota, USA. June, 2022.

Robert Valentic / Bandy bandy (Vermicella annulata) male showing looping behaviour, from Mt Glorious near Brisbane, Queensland, Australia. Controlled conditions.