Charlie Summers,Charlie Summers / The comet 'PANSTARRS' in transit above the Rocky Mountains, Colorado. March 19, 2013 20:18. This is a stack of nine images, averaged and then stretched, a common practice in astrophotography, to brin...

Charlie Summers / The transit of Venus across the face of the sun, with visible sunspots, as seen from Aurora, Colorado, USA, 19.51 local time, 5 June 2012.

Eric Baccega / Beauval zoo staff checking and comforting Western lowland gorilla (Gorilla gorilla gorilla) female in transit. To be reintroduced through Gabon Gorilla Protection Project to Bateke Plateau National Pa...

David Fleetham / Research divers extending a transit line to begin a species count. Data from here will help to determine the health of Hawaii's reefs. Hawaii. Model released

SCOTLAND: The Big Picture / Becky Priestley, Wildlife Officer with Trees for Life, removing tape from transit box containing Red squirrel (Sciurus vulgaris). Translocation part of reintroduction to the north west Highlands, Pl...

SCOTLAND: The Big Picture / Becky Priestley, Wildlife Officer with Trees for Life, attaching transit box containing Red squirrel (Sciurus vulgaris) to tree, as part of reintroduction to the north west Highlands, Plockton, Scotla...

SCOTLAND: The Big Picture / Remote camera shot of Red squirrel (Sciurus vulgaris) emerging from transit box following its translocation from Moray to Plockton, Scotland, UK. Winner of the Documentary Series Category of the Briti...

SCOTLAND: The Big Picture / Becky Priestley, Wildlife Officer with Trees for Life, removing moss from hole in transit box containing Red squirrel (Sciurus vulgaris). Translocation part of reintroduction to the north west Highlan...

Charlie Summers / Transit of Mercury in front of the sun as seen from Denver, Colorado at 07:09 on 9 May 2016 Mercury is the dot in the lower portion of the sun, all other dots are sun spots.

Charlie Summers / Transit of Mars in front of the sun on May 9, 2016 at 07.29 local time in Denver, USA.

Gary K. Smith / Steam train on the Heritage Poppy Line from Sheringham to Holt, with Weybourne Mill in background, Norfolk, UK, April.

Pal Hermansen / Tractor pulling load of freshly picked tea (Camellia sinensis) at tea plantation, Sri Lanka, March 2005.

David Pattyn / Tourists in vehicle following and watching old female Bengal tiger (Panthera tigris tigris) Ranthambore National Park, Rajasthan, India.

Angelo Gandolfi / Maned Wolf (Chrysocyon brachyurus) at Santurio do Caraca at night, coming to be fed, with tourists watching, Parque do Caraca, Minas Gerais, Brazil, October 2010.

Angelo Gandolfi / Maned Wolf (Chrysocyon brachyurus) at Santurio do Caraca at night, coming to be fed, with tourists watching, Parque do Caraca, Minas Gerais, Brazil, October 2010.

Jean E. Roche / People on sun loungers on the beach during summer, Saintes Maries de la mer. Camargue, France. June 2013.

Ernie Janes / Sri lankan elephants (Elephas maximus maximus) from Pinnawala Elephant Orphanage bathing in the Maha Oya river with their carers nearby, part of a scheme run by the Sri Lankan Department of Wildlife,...

Ernie Janes / Tourists watching Sri lankan elephants (Elephas maximus maximus) from Pinnawala Elephant Orphanage bathing in the Maha Oya river, part of a scheme run by the Sri Lankan Department of Wildlife, Sri La...

Loic Poidevin / Container Ships, Prince Rupert Harbour, British Columbia, Canada, June 2013.

Loic Poidevin / Geirangerfjord with liners, Stranda municipality, Sunnylvsfjorden UNESCO World Heritage Site, Norway, June 2010.

Loic Poidevin / Geirangerfjord with cruise ships , Stranda municipality, Sunnylvsfjorden UNESCO World Heritage Site, Norway, June 2010.

Will Watson / Market Square and St. Mary's Church with Swifts (Apus apus) Krakow, Poland. July 2013.

Will Watson / Malopolski horses (Little Poland Horses) pulling carriage, Market Square, Krakow, Poland, July 2013

Konrad Wothe / Tourist boat and Mauriti Palm Trees (Mauritia flexuosa) at Sandoval Lake, Tambopata National Reserve, Peru, South America.

Gary K. Smith / Woman walker enjoying the view to Rubha Nan Gall Lighthouse, North of Tobermory, Isle of Mull, Scotland, UK, May 2013.

Enrique Lopez-Tapia / Domestic Asian elephants (Elephas maximas) used for riding safaris with their keepers, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Domestic Asian elephants (Elephas maximas) used for riding safaris with their keepers, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Tourists riding on domestic Indian elephant (Elephas maximas) during wildlife safari, Royal Chitwan National Park, Nepal.

Enrique Lopez-Tapia / Tourists on domestic Indian Elephant (Elephas maximas) safari, Royal Chitwan National Park, Nepal. October 2011.

Enrique Lopez-Tapia / Tourists riding domesticated Indian Elephant (Elephas maximas) on safari, Royal Chitwan National Park, Nepal. October 2011.

Adrian Davies / Cliffs with Gannet (Morus bassanus) colony and tourist boat of birdwatchers, at Hermaness, Shetland, Scotland, May 2013.

Juan Carlos Munoz / Tourists observing Hippopotamuses (Hippopotamus amphibius) in aggressive interaction, captive. Valencia Bioparc, Valencia, Spain. July 2013.

Christophe Courteau / Landscape view of the Bockfjorden from a sailing boat, part of the Woodfjorden, Spitzbergen, Svalbard, June 2012. Property released.

Christophe Courteau / View from the top of a mast of a sailing boat in pack ice in Woodfjord, Svalbard, Norway, June, 2012.

Christophe Courteau / View from a sailing boat of pack ice in Woodfjord, Svalbard, Norway, June, 2012.

Michele Westmorland / Tourist exploring the lava caves on the island of Santa Cruz, Galapagos Islands, January 2012. Model released.

Michele Westmorland / Tourists viewing Spotted eagle rays (Aetobatus narinar) from a inflatable. Galapagos Islands, January 2012. Model released.

Michele Westmorland / Tourist exploring the lava caves on the island of Santa Cruz, Galapagos Islands, January 2012. Model released.

Michele Westmorland / Tourists walking from Charles Darwin Research Centre, Galapagos Islands, August 2010. Model released.

Michele Westmorland / Tourist observing Galapagos giant tortoise (Chelonoidis nigra) Galapagos Islands. January 2012, Vulnerable species.

Michele Westmorland / Tourists viewing Galapagos giant tortoises (Chelonoidis nigra) taking mud bath, Galapagos Islands, January 2012. Model released.

Michele Westmorland / Tourists looking at Galapagos giant tortoise (Chelonoidis nigra) captive at Charles Darwin Research Center of Galapagos Islands, August 2010. Model released.

Michele Westmorland / Tourists walking through Charles Darwin Research Center, Galapagos Islands. August 2010. Model released.

Michele Westmorland / Tourists walking through Charles Darwin Research Center, Galapagos Islands. August 2010. Model released.

Michele Westmorland / Tourist exploring the lava caves on the island of Santa Cruz, Galapagos Islands, January 2012. Model released.

Michele Westmorland / Sign for walking trail in Charles Darwin Research Center, with Opuntia cactus, Galapagos Islands.

Michele Westmorland / Passengers being ferried to dive excursion vessel at the marina in San Cristobal, Galapagos Islands, September 2011. Property released and model released.

Michele Westmorland / Woman filming Galapagos sea lion (Zalophus wollebaeki) on the beach of Islabela Island, Galapagos Island, Model released.

Michele Westmorland / Woman observing Marine iguana (Amblyrhynchus cristatus) Isabela Island, Galapagos Islands, August 2010. Model released.

Ann & Steve Toon / Tourist watching a White rhinoceros (Ceratotherium simum) mother and calf, Phinda Private Reserve, KwaZulu Natal, South Africa, February 2013.

Tom Gilks / Pony pulling couple on a trotting cart, Appleby, Yorkshire

Kirkendall-Spring / Grand Prisnatic Spring with tourists walking along surrounding path, Midway Geyser Basin of Yellowstone National Park, Wyoming, USA, June 2013.

Kirkendall-Spring / Pioneer Square Station for bus and Sound Transit trains in Seattle, Washington, USA. February 2013.

Kirkendall-Spring / Pioneer Square Station for bus and Sound Transit trains in Seattle, Washington, USA. February 2013.

Kirkendall-Spring / Old Faithful Visitor Education Center in snow, Yellowstone National Park, Wyoming, USA, February 2013.

Cheryl-Samantha Owen / Whale watching guide gives a lecture to whale watching tourists on board about Humpback whales, Orcas and other marine mammals and the negative effects of marine pollution on these animals. Johnstone...

Kirkendall-Spring / Crowd observing the Turban and Giant Geysers in the Upper Geyser Basin of Yellowstone National Park, Wyoming, USA, June 2013.

Juan Carlos Munoz / Toursists in a boat moving up the River Kinabatangan through lowland rainforest, Sabah, Malaysia, Borneo.

Wild Wonders of Europe / Widstr / Tourists watching wildlife, Deven area, Western Rhodope Mountains, Bulgaria, May 2013.

Wild Wonders of Europe / Widstr / Ski resort with ski lifts, Pamporovo, Western Rhodope Mountains, Bulgaria, May 2013.

Wild Wonders of Europe / Widstr / Ski resort, Pamporovo, Western Rhodope Mountains, Bulgaria, May 2013.

Wild Wonders of Europe / Widstr / Ranger and field officer Todor Mitkov with binoculars, Plevun, Eastern Rhodope Mountains, Bulgaria, May 2013.

Wild Wonders of Europe / Widstr / Birdwatching guide and nature photographer Mladen Vasilev, Eastern Rhodope Mountains, Bulgaria, May 2013.

Enrique Lopez-Tapia / Gentoo penguin (Pygoscelis papua) in snow, with tourists walking in the background, Danco Island. Antarctic Peninsula, Antarctica

Pedro Narra / Bottlenose Dolphins (Tursiops truncatus) playing near beach, Sado Estuary, Portugal

Enrique Lopez-Tapia / Tourists walking through footpath in Lenga beech forest (Nothofagus pumilio) Tierra del Fuego National Park. Argentina.

Enrique Lopez-Tapia / Sign for Lapataia Bay, Tierra del Fuego National Park. Argentina

Enrique Lopez-Tapia / Tourists watching Gentoo penguin (Pygoscelis papua) at Gonzalez Videla Station, Chile. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists and Gentoo penguin (Pygoscelis papua) Petermann Island. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourist with some Gentoo penguins (Pygoscelis papua) Danco Island. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists disembarking from zodiac boat with Antarctic cruise liner 'MV Ushuaia' in the background Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists on zodiac boat with Antarctic cruise liner 'MV Ushuaia' in the background Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists looking out across Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists looking out across Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Tourists observing a memorial cross in honour of British Antarctic Survey crew, Ambrose C Morgan, Kevin P Ockleton and John Coll who died in 14 Aug 1982. Petermann Island. Antarctic peninsula, Antarct...

Enrique Lopez-Tapia / Tourist walking in Petermann Island. Antarctic cruise.

Enrique Lopez-Tapia / Antarctic fur-seal (Artocephalus gazella) on an ice floe being watched by tourists in a zodiac boat, Antarctic Peninsula, Antarctica

Enrique Lopez-Tapia / Gentoo penguins (Pygoscelis papua) and Antarctic cruise liner 'MV Ushuaia' in Neko Harbour, Andvord Bay. Antarctic Peninsula, Antarctica.

Enrique Lopez-Tapia / Zodiac boat with curious leopard seal (Hydrurga leptonyx) Wilhelmina Bay, Gerlache Strait. Antarctic Peninsula, Antarctica.

Richard Du Toit / Springbok (Antidorcas marsupialis) herd crossing road in front of tourist vehicle. Kgalagadi Park, South Africa

Roland Seitre / Dumbea Golf course, Noumea, South Province, New Caledonia.

Roland Seitre / Tourist Catamaran near Oro Bay / Baie d'Oro, Ile des Pins / Isle of Pines. North Province. New Caledonia.

Alex Mustard / People watch Sockeye salmon (Oncorhynchus nerka) migration from a viewing platform over Adams River. Part of the eco-tourism associated with the salmon run. Adams River, British Columbia, Canada, Octo...

Alex Mustard / Road sign for Sockeye salmon (Oncorhynchus nerka) spawning eco-tourism. Adams River, British Columbia, Canada, October.

Alex Mustard / Road sign for Sockeye salmon (Oncorhynchus nerka) run Adams River, British Columbia, Canada, October.

Merryn Thomas / Viewing platform on the summit of the Schilthorn (2,970m), Bernese Oberland, Switzerland, June 2012.

Neil Aldridge / A researcher working for the Endangered Wildlife Trust using radio telemetry equipment to track African wild dogs (Lycaon pictus) whilst walking with tourists, Venetia Limpopo Nature Reserve, Limpopo...

Franco Banfi / Group in small paddle boat in search of anaconda, with photography equipment, Formoso River, Bonito, Mato Grosso do Sul, Brazil

Franco Banfi / Tourist on the boat feeding Piraputanga (Brycon hilarii) Aqua¡rio Natural, Bonito, Mato Grosso do Sul, Brazil

Juergen Freund / Transit of Venus, as seen from North Queensland, Australia, 6th June 2012 at 9.43.

Mark Taylor / Transit of Venus across the sun, partially obscured by clouds, Surrey, UK, 6th June 2012

Charlie Summers / The transit of Venus across the face of the sun, with visible sunspots, as seen from Aurora, Colorado, USA, 16.24 local time, 5 June 2012.

Charlie Summers / The transit of Venus across the face of the sun, with visible sunspots, as seen from Aurora, Colorado, USA, 18.01 local time, 5 June 2012.

Juergen Freund / Transit of the planet Venus acros the Sun, projected onto hand, Cairns, North Queensland, Australia, 11:41 local time, 6 June 2012.

Juergen Freund / Transit of the planet Venus acros the Sun, taken from Cairns, North Queensland, Australia, image taken with use of a BAADER filter, 09.43 local time, 6 June 2012.

Charlie Summers / The transit of Venus across the face of the sun, with visible sunspots, as seen from Aurora, Colorado, USA, 19.49 local time, 5 June 2012.