Birds are seen on the back of a giraffe in the Maasai Mara National Reserve, Kenya, October 15, 2019. REUTERS/Baz Ratner TPX IMAGES OF THE DAY 

Deer are seen during the early morning at Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

Deer are seen clashing antlers during the rutting season in the early morning at Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

Deer are seen clashing antlers during the rutting season in the early morning at Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

A deer is seen with the sun rising behind at dawn in Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

A deer is seen with the sun rising behind at dawn in Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

A deer is seen with the sun rising behind at dawn in Richmond Park, west London, Britain, September 20, 2019. REUTERS/Toby Melville 

The sun sets as smoke, caused by forest fires, covers the land in Palangka Raya, Central Kalimantan province, Indonesia, September 14, 2019. REUTERS/Willy Kurniawan SEARCH "KURNIAWAN RAYA" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

Birds sit on the back of a zebra in the Nairobi National Park, near Nairobi, Kenya, November 21, 2018. REUTERS/Baz Ratner TPX IMAGES OF THE DAY 

Birds sit on the back of a zebra in the Nairobi National Park, near Nairobi, Kenya, November 21, 2018. REUTERS/Baz Ratner 

A male deer stands in a field in Republican landscape reserve "Nalibotsky" near the village of Kozliki, Belarus September 20, 2018. REUTERS/Vasily Fedosenko TPX IMAGES OF THE DAY 

Bees are seen on the frame of a beehive in Denee, Belgium, May 15, 2018. Picture taken May 15, 2018. REUTERS/Yves Herman TPX IMAGES OF THE DAY 

A Palestinian beekeeper uses smoke to calm bees in the process of collecting honey at a farm near the Israel-Gaza border in the northern Gaza Strip April 19, 2018. REUTERS/Suhaib Salem TPX IMAGES OF THE DAY 

People feed elephants before a match at the annual King's Cup Elephant Polo Tournament at a riverside resort in Bangkok, Thailand March 8, 2018. REUTERS/Soe Zeya Tun 

Elephants are seen during a match at the annual King's Cup Elephant Polo Tournament at a riverside resort in Bangkok, Thailand March 8, 2018. REUTERS/Soe Zeya Tun 

Performers are seen before a match at the annual King's Cup Elephant Polo Tournament at a riverside resort in Bangkok, Thailand March 8, 2018. REUTERS/Soe Zeya Tun 

A dog licks the head of a Jacob sheep, in Ramot Naftali, Israel, February 21, 2018. Picture taken February 21, 2018. REUTERS/Amir Cohen TPX IMAGES OF THE DAY 

A dog licks the head of a Jacob sheep, in Ramot Naftali, Israel, February 21, 2018. Picture taken February 21, 2018. REUTERS/Amir Cohen 

A Grevy's zebra, the most threatened species of zebra, grazes at the Mpala research centre in Laikipia County, Kenya, January 7, 2018. Picture taken January 7, 2018. REUTERS/Baz Ratner 

Birds gather to warm themselves in a boat at the frozen Dojran lake, Macedonia January 11, 2017, as icy weather continues across Europe. REUTERS/Ognen Teofilovski TPX IMAGES OF THE DAY 

A car drives in front of DONG Energy's power station, which provides steam, ash and gypsum as waste products to other companies for their use in Kalundborg, Denmark, November 20, 2015. As pioneers of so-called industrial symbiosis, these companies swap waste and byproducts to cut costs and carbon dioxide (CO2) emissions profitably -- an approach that offers big business a financial incentive that could be crucial to nations striving to meet targets agreed at this month's global climate summit. Their success has attracted attention globally, with more than 30 corporate and municipal delegations from 20 countries visiting the town this year, including mayors from China's fast-growing Guandong province. To match story INDUSTRY-EMISSIONS/ REUTERS/Sabina Zawadzki 

A bicycle for employees of Novo Nordisk company, where half of the world's insulin is produced, stands at its facility in Kalundborg, Denmark, November 20, 2015. As pioneers of so-called industrial symbiosis, these companies swap waste and byproducts to cut costs and carbon dioxide (CO2) emissions profitably -- an approach that offers big business a financial incentive that could be crucial to nations striving to meet targets agreed at this month's global climate summit. Their success has attracted attention globally, with more than 30 corporate and municipal delegations from 20 countries visiting the town this year, including mayors from China's fast-growing Guandong province. To match story INDUSTRY-EMISSIONS/ REUTERS/Sabina Zawadzki 

Picture shows algae grown in waste water from companies Novo Nordisk and Novozymes in a facility in Kalundborg, Denmark, November 20, 2015. The Algae can be used to clean water by eating pollutants, for fish feed or its pigments extracted for the pharmaceutical industry. As pioneers of so-called industrial symbiosis, these companies swap waste and byproducts to cut costs and carbon dioxide (CO2) emissions profitably -- an approach that offers big business a financial incentive that could be crucial to nations striving to meet targets agreed at this month's global climate summit. Their success has attracted attention globally, with more than 30 corporate and municipal delegations from 20 countries visiting the town this year, including mayors from China's fast-growing Guandong province. To match story INDUSTRY-EMISSIONS/ REUTERS/Sabina Zawadzki 

A general view shows DONG Energy's power station, which provides steam, ash and gypsum as waste products to other companies for their use in Kalundborg, Denmark, November 20, 2015. As pioneers of so-called industrial symbiosis, these companies swap waste and byproducts to cut costs and carbon dioxide (CO2) emissions profitably -- an approach that offers big business a financial incentive that could be crucial to nations striving to meet targets agreed at this month's global climate summit. Their success has attracted attention globally, with more than 30 corporate and municipal delegations from 20 countries visiting the town this year, including mayors from China's fast-growing Guandong province. To match story INDUSTRY-EMISSIONS/ REUTERS/Sabina Zawadzki 

A general view shows DONG Energy's power station, which provides steam, ash and gypsum as waste products to other companies for their use in Kalundborg, Denmark, November 20, 2015. As pioneers of so-called industrial symbiosis, these companies swap waste and byproducts to cut costs and carbon dioxide (CO2) emissions profitably -- an approach that offers big business a financial incentive that could be crucial to nations striving to meet targets agreed at this month's global climate summit. Their success has attracted attention globally, with more than 30 corporate and municipal delegations from 20 countries visiting the town this year, including mayors from China's fast-growing Guandong province. To match story INDUSTRY-EMISSIONS/ REUTERS/Sabina Zawadzki 

People walk past cast bronze sculptures, created by Russian Buryat artist Dashi Namdakov on an embankment of the Yenisei River in the town of Kyzyl, administrative centre of Tuva region, Southern Siberia, Russia, October 7, 2015. Dashi Namdakov is a representative of Buryats, native people of Siberia, who lives and works in Britain and Italy, casts bronze, silver and gold sculptures based on symbiosis of national traditions of nomad Buddhists, West European myths and classical art school, according to local media. Tuva region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. Picture taken October 7, 2015. REUTERS/Ilya Naymushin 

Pupils and a teacher gather on an embankment of the Yenisei River near "The Centre of Asia" cast bronze sculpture by Russian Buryat artist Dashi Namdakov in the town of Kyzyl, administrative centre of Tuva region, Southern Siberia, Russia, October 11, 2015. Dashi Namdakov is a representative of Buryats, native people of Siberia, who lives and works in Britain and Italy, casts bronze, silver and gold sculptures based on symbiosis of national traditions of nomad Buddhists, West European myths and classical art school, according to local media. Tuva region is inhabited by Tuvans, historically cattle-herding nomads, who nowadays practise two main confessions - Buddhism and Shamanism. Picture taken October 11, 2015. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY

A Red deer stag barks, with a female seen behind, in the morning sun in Richmond Park in west London, Britain, October 2, 2015. The Royal Park has had Red and Fallow deer present since 1529, and early autumn sees the rutting or breeding season begin amongst the herd of over six hundred animals. REUTERS/Toby Melville TPX IMAGES OF THE DAY

A male deer roars in a field near the village of Dobrovolya, southwest of Minsk, September 20, 2015. REUTERS/Vasily Fedosenko TPX IMAGES OF THE DAY

A pink flamingo is pictured during a hot summer day at the zoo of Wuppertal, Germany, July 2, 2015. A widespread, long-lasting heat wave will spread across much of France, U.K., Belgium, the Netherlands and western Germany with forecast highs on Wednesday reaching 35 degrees Celsius (95 degrees Fahrenheit). REUTERS/Wolfgang Rattay TPX IMAGES OF THE DAY 

An Afghan herder walks with his flock near forward operating base Gamberi, in the Laghman province of Afghanistan, December 15, 2014. REUTERS/Lucas Jackson (AFGHANISTAN - Tags: CIVIL UNREST MILITARY SOCIETY TPX IMAGES OF THE DAY) 

A visitor walks near the "Amazon" (L) and "Garuda" cast bronze sculptures by Russian artist Dashi Namdakov at his personal exhibition "The Bronze Asia" at the Surikov Art Museum during the 4th Krasnoyarsk International Music Festival of the Asian-Pacific region, in central Krasnoyarsk, Siberia July 1, 2014. Dashi Namdakov is a representative of Buryats, the native people of Siberia, who lives and works in Britain and Italy, casting bronze, silver and gold sculptures based on symbiosis of national traditions of nomad Buddhists, West European myths and classical art school, according to organizers. More than 600 artists, dancers and actors representing 29 countries from all over the world will take part in more than 100 concerts and exhibitions during a one-week-long festival in the centre of Siberia, according to organizers. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

A student looks at the "Ritual" cast and patinated bronze sculpture by Russian artist Dashi Namdakov at his personal exhibition "The Bronze Asia" at the Surikov Art Museum during the 4th Krasnoyarsk International Music Festival of the Asian-Pacific region, in central Krasnoyarsk, Siberia July 1, 2014. Dashi Namdakov is a representative of Buryats, the native people of Siberia, who lives and works in Britain and Italy, casting bronze, silver and gold sculptures based on symbiosis of national traditions of nomad Buddhists, West European myths and classical art school, according to organizers. More than 600 artists, dancers and actors representing 29 countries from all over the world will take part in more than 100 concerts and exhibitions during a one-week-long festival in the centre of Siberia, according to organizers. REUTERS/Ilya Naymushin (RUSSIA - Tags: SOCIETY) 

Customers rest their feet in a tank containing "doctor fish" at a "fish spa" inside a shopping mall in Singapore December 18, 2010. The "fish spa" consists of shallow tanks of Garra Rufa fish. The fish exfoliate feet by eating away dead skin, according to the spa company. REUTERS/Vivek Prakash (SINGAPORE - Tags: HEALTH IMAGES OF THE DAY) 

Research director Francis Martin inspects hazelnut tree roots in a greenhouse at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE ENVIRONMENT FOOD SCI TECH) 

Senior scientist Claude Murat uses liquid nitrogen to extract DNA from a sample of truffle at a INRA laboratory (French National Agronomical Research Institute) in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Senior scientist Claude Murat displays samples of frozen Tuber Melanosporum, the Perigord black truffle (R) and Chinese truffle (L), at the INRA (French National Institute for Agricultural Research) laboratory in Champenoux, near Nancy, April 1, 2010. The INRA research unit, led by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate its natural growth. REUTERS/Vincent Kessler (FRANCE ENVIRONMENT - Tags: AGRICULTURE FOOD SCI TECH) 

Research director Francis Martin inspects hazelnut tree roots in a greenhouse at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE ENVIRONMENT FOOD SCI TECH) 

Senior scientist Claude Murat looks at DNA fingerprints of truffles at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Senior scientist Claude Murat uses liquid nitrogen to extract DNA from a sample of truffle at a INRA laboratory (French National Agronomical Research Institute) in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Senior scientist Claude Murat slices through a truffle sample to prepare it for DNA extraction at a the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Samples of truffles (L to R), Chinese truffle, Perigord black truffle, Bourgogne truffle and Italian white truffle are displayed at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Senior scientist Claude Murat displays samples of frozen Tuber Melanosporum, the Perigord black truffle (R) and Chinese truffle (L), at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE FOOD SCI TECH) 

Research director Francis Martin inspects hazelnut tree roots in a greenhouse at the INRA (French National Agronomical Research Institute) laboratory in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE ENVIRONMENT FOOD SCI TECH) 

Senior scientist Claude Murat uses liquid nitrogen to extract DNA from a sample of truffle at a INRA laboratory (French National Agronomical Research Institute) in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE ENVIRONMENT FOOD SCI TECH) 

Senior scientist Claude Murat displays a sample of frozen Tuber Melanosporum (Perigord black truffle) at a INRA laboratory (French National Agronomical Research Institute) in Champenoux near Nancy, April 1, 2010. The INRA research unit, lead by research director Francis Martin, has sequenced the genome of the Perigord black truffle to better understand the symbiosis between trees and fungus, including truffles, to ameliorate it's natural growth. REUTERS/Vincent Kessler (FRANCE - Tags: AGRICULTURE ENVIRONMENT FOOD SCI TECH) 

Keita Yamagata (L), a student of Waseda University, assists a participant in driving a one-person Ultra Lightweight Fuel Cell Vehicle (ULFCV) car at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as a part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

Eiichi Oki, a student of Waseda University, demonstrates a robot to support elderly people in walking, at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as a part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

A participant uses training units for coronary artery bypass surgery at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

A participant uses training units for coronary artery bypass surgery at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

Park Young-kwang (L), a doctoral course postgraduate of Waseda University, helps a participant in using training units for coronary artery bypass surgery at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

Noh Yohan (R), a master's course postgraduate of Waseda University, demonstrates training units for tracheal intubation in front of participants at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

A participant uses training units for tracheal intubation at the Robotics Boot Camp event at a Waseda University campus in Tokyo August 5, 2007. The event is organised for school and university students, as part of Waseda University's 21st Century Centre of Excellence (COE) Programme "The innovative research on symbiosis technologies for human and robots in the elderly dominated society", to understand robotic technology by using the latest robots, the organiser said. REUTERS/Kiyoshi Ota (JAPAN) 

Renee Jaworski (top) and Otis Cook from the dance company Pilobolus perform "Symbiosis' at 'Dance Across the City at the Strand' in Boston, Massachusetts January 5, 2007. The performance was held the night before "Dance Across the City', a day of dances classes, demonstrations and performances by scores of local and national dance compaines, all free to the public. REUTERS/Brian Snyder (UNITED STATES) 

Dancers from Pilobolus Dance Theatre perform during their show "Symbiosis" at Santander's Palacio de Festivales in northern Spain May 5, 2006. U.S. Pilobolus company has developed in their peformances a combination of dance, gymnastics and acrobatics. REUTERS/Victor Fraile 

Dancers from Pilobolus Dance Theatre perform during their show "Symbiosis" at Santander's Palacio de Festivales in northern Spain May 5, 2006. U.S. Pilobolus company has developed in their peformances a combination of dance, gymnastics and acrobatics. REUTERS/Victor Fraile 

Dancers from Pilobolus Dance Theatre perform during their show "Symbiosis" at Santander's Palacio de Festivales in northern Spain May 5, 2006. U.S. Pilobolus company has developed in their performances a combination of dance, gymnastics and acrobatics. REUTERS/Victor Fraile 

A Chinese worker assembles parts of solar panels to be exported to the
United States at Solar Science Green Energy factory on the outskirts of
Shanghai September 3, 2003. China and the United States agreed on
Wednesday that the yuan should eventually float freely, but Beijing
resisted calls by the visiting U.S. Treasury Secretary John Snow to
speed up the process, fearing it will worsen unemployment.
REUTERS/Claro Cortes IV

CC/TW 

Chinese workers assemble solar panels to be exported to the United
States at Solar Science Green Energy factory on the outskirts of
Shanghai September 3, 2003. China and the United States agreed on
Wednesday that the yuan should eventually float freely, but Beijing
resisted calls by the visiting U.S. Treasury Secretary John Snow to
speed up the process, fearing it will worsen unemployment.
REUTERS/Claro Cortes IV

CC/TW