A man stands in front of the Skogafoss waterfall in Skogar, Iceland March 8, 2020. Picture taken March 8, 2020. REUTERS/Hannah McKay TPX IMAGES OF THE DAY

A man stands in front of the Skogafoss waterfall in Skogar, Iceland March 8, 2020. Picture taken March 8, 2020. REUTERS/Hannah McKay

A police car is seen in front of the Great Pyramids in Giza, on the outskirts of Cairo, Egypt October 26, 2019. REUTERS/Mohamed Abd El Ghany

A general view shows pyramids in Giza, on the outskirts of Cairo, Egypt October 26, 2019. REUTERS/Mohamed Abd El Ghany

A group of elephants are seen near a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A group of elephants and giraffes walk near a carcass of an elephant at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A group of elephants and giraffes walk near a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A group of elephants are seen at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A group of elephants walk near a solar panel at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A marabou stork stands on an elephant carcass at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo TPX IMAGES OF THE DAY

A lion is seen approaching an elephant carcass at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A lion is seen approaching an elephant carcass at a watering hole inside Hwange National Park, in Zimbabwe, October 23, 2019. REUTERS/Philimon Bulawayo

A view shows a giant foot print, which was trodden on the ground following an early snowfall in the Siberian city of Omsk, Russia October 18, 2019. REUTERS/Alexey Malgavko TPX IMAGES OF THE DAY

A hawk appears to tussle with a group of smaller birds near the White House in Washington, U.S., October 15, 2019. REUTERS/Jonathan Ernst

A leopard walks past an elephant in the Maasai Mara National Reserve, Kenya, October 15, 2019. REUTERS/Baz Ratner TPX IMAGES OF THE DAY

An elephant walks through the Maasai Mara National Reserve, Kenya, October 15, 2019. REUTERS/Baz Ratner TPX IMAGES OF THE DAY

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

Elephants walk through the Maasai Mara National Reserve, Kenya, October 15, 2019.REUTERS/Baz Ratner

Elephants walk through the Maasai Mara National Reserve, Kenya, October 14, 2019. Picture taken October 14, 2019. REUTERS/Baz Ratner

Elephants walk through the Maasai Mara National Reserve, Kenya, October 14, 2019. Picture taken October 14, 2019. REUTERS/Baz Ratner

The moon rises over Stoneham, Colorado, U.S. October 12, 2019. REUTERS/Jim Urquhart

A paraglider flies above the Bossons glacier in the Mont-Blanc massif on a sunny autumn day in Chamonix, France October 8, 2019. REUTERS/Denis Balibouse

A man rests near the Temple of Hercules at Amman Citadel, an ancient Roman landmark in Amman, Jordan October 7, 2019. REUTERS/Amr Abdallah Dalsh

Sun is seen in the skyline in Bangkok, Thailand, Thailand, September 30, 2019. REUTERS/Soe Zeya Tun

Sun rises in a field in Republican landscape reserve "Nalibokski" near the village of Kozliki, Belarus September 26, 2019. Picture taken September 26,. 2019. REUTERS/Vasily Fedosenko

A general view of buildings by the Nile River in Cairo, Egypt September 26, 2019. REUTERS/Mohamed Abd El Ghany

A view of the steel bridge known as "Imbaba Bridge" over the Nile River and the surrounding buildings in Cairo, Egypt September 26, 2019. REUTERS/Mohamed Abd El Ghany

A segment of the Planpincieux glacier is seen on the Italian side of the Mont Blanc massif area of Planpincieux, Aosta, Italy, September 26, 2019. REUTERS/Yara Nardi

The Pasterze Glacier, Austria's largest glacier, is seen below Johannisberg summit located in the Hohe Tauern mountain range, in the Austrian province of Carinthia, August 14, 2011. REUTERS/Lisi Niesner SEARCH "AUSTRIA GLACIERS" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES.

The Mont-Blanc is pictured from Les Diablerets, Switzerland, September 13, 2019. Picture taken September 13, 2019. REUTERS/Denis Balibouse

A passenger plane passes in front of the full moon as it makes it's final landing approach to Heathrow Airport, London, Britain, September 14, 2019. Picture taken on September 14, 2019. REUTERS/Toby Melville

The moon is seen rising behind the Seven Sisters Cliffs at Birling Gap in East Sussex, Britain, September 13, 2019. REUTERS/Toby Melville

The moon is seen rising behind the Seven Sisters Cliffs at Birling Gap in East Sussex, Britain, September 13, 2019. REUTERS/Toby Melville

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas

Fatima, a two-year-old hippopotamus rescued from a circus, opens its mouth at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas

Fatima, a two-year-old hippopotamus rescued from a circus, swims at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas

Fatima, a two-year-old hippopotamus rescued from a circus, is fed at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas

Fatima, a two-year-old hippopotamus rescued from a circus, shakes its head at the zoo in Managua, Nicaragua September 12, 2019. REUTERS/Oswaldo Rivas

A passenger plane passes in front of the moon as it makes its final landing approach to Heathrow Airport in London, Britain September 12, 2019. REUTERS/Toby Melville

A passenger plane passes in front of the moon as it makes its final landing approach to Heathrow Airport in London, Britain September 12, 2019. REUTERS/Toby Melville TPX IMAGES OF THE DAY

The early morning sun lights up the London skyline, seen from east London, Britain, September 10, 2019. REUTERS/Angie Dixon

People walk along a pier during sunset in the Black Sea port of Sevastopol, Crimea August 23, 2019. REUTERS/Alexey Pavlishak

A passenger plane flies in the sky as the Moon is seen in Berlin, Germany, August 23, 2019. REUTERS/Fabrizio Bensch

A passenger plane flies in the sky as the Moon is seen in Berlin, Germany, August 23, 2019. REUTERS/Fabrizio Bensch

Power-generating windmill turbines are pictured during sunset from the Drachenberg hill in Berlin, Germany, August 19, 2019. REUTERS/Fabrizio Bensch

Power-generating windmill turbines are pictured during sunset from the Drachenberg hill in Berlin, Germany, August 19, 2019. REUTERS/Fabrizio Bensch

Aldabra giant tortoises eat carrots at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

An Aldabra giant tortoise looks at visitors at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

An Aldabra giant tortoise looks at visitors at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Aldabra giant tortoises are pictured at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Two Aldabra giant tortoises mate at the La Vanille Nature Park in Riviere des Anguilles, Mauritius, August 19, 2019. REUTERS/Benoit Tessier

Followers of the Universal White Brotherhood, an esoteric society that combines Christianity and Indian mysticism set up by Bulgarian Peter Deunov in the 1920s, perform a dance-like ritual called "paneurhythmy" in Rila Mountain, Bulgaria, August 19, 2019. REUTERS/Stoyan Nenov

An orange full moon rises in the Strait of Gibraltar, Spain, August 15, 2019. Picture taken August 15, 2019. REUTERS/Jon Nazca REUTERS/Jon Nazca

A full moon rises behind the Temple of Poseidon in Cape Sounion, near Athens, Greece, August 15, 2019. REUTERS/Michalis Karagiannis

A full moon rises behind the Temple of Poseidon in Cape Sounion, near Athens, Greece, August 15, 2019. REUTERS/Michalis Karagiannis

A full moon rises behind the Temple of Poseidon in Cape Sounion, near Athens, Greece, August 15, 2019. REUTERS/Michalis Karagiannis TPX IMAGES OF THE DAY

A ski lift at the Kalavrita ski centre on Mount Helmos is silhouetted as the moon rises near the town of Kalavrita, Greece, August 14, 2019. REUTERS/Alkis Konstantinidis TPX IMAGES OF THE DAY

Large waves hit the harbour at Porthleven, Britain, August 10, 2019. REUTERS/Toby Melville.

An elephant walks at Kaudulla national park in Habarana, Sri Lanka August 6, 2019. Picture taken August 6, 2019. REUTERS/Dinuka Liyanawatte

The sun sets over the area of a confluence of Angara and Yenisei rivers, shrouded in smoke from wildfires, in the Siberian village of Strelka, Krasnoyarsk region, Russia August 2, 2019. Picture taken August 2, 2019. REUTERS/Ilya Naymushin