Hamish the first polar bear bear cub to be born in the UK for 25 years cools down in the pond in his enclosure at The Highland Wildlife Park near Kingussie, Scotland, Britain July 26, 2018. REUTERS/Russell Cheyne 

Hamish the first polar bear bear cub to be born in the UK for 25 years cools down in the pond in his enclosure at The Highland Wildlife Park near Kingussie, Scotland, Britain July 26, 2018. REUTERS/Russell Cheyne 

Hamish the first polar bear bear cub to be born in the UK for 25 years cools down in the pond in his enclosure at The Highland Wildlife Park near Kingussie, Scotland, Britain July 26, 2018. REUTERS/Russell Cheyne 

A man jumps into a sprinkler in Berlin, Germany, July 25, 2018. REUTERS/Hannibal Hanschke 

A dog retreives a stick, from the lake in St James'sPark, in central London, Britain July 24, 2018. REUTERS/Hannah McKay 

Socks are left to dry in the village of La Estrella, Spain, May 24, 2018. For more than 30 years, Juan Martin and his wife Sinforosa Sancho have lived alone in the village in Spain's eastern highlands that once had more than 200 inhabitants. REUTERS/Susana Vera SEARCH "SPAIN DEPOPULATION" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. 

A man splashes in a puddle in Times Square during a heavy midday downpour in New York City, U.S., July 17, 2018. REUTERS/Brendan McDermid TPX IMAGES OF THE DAY 

A man splashes in a puddle in Times Square during a heavy midday downpour in New York City, U.S., July 17, 2018. REUTERS/Brendan McDermid 

A trolley splashes water during heavy rain in central Minsk, Belarus, July 13, 2018. REUTERS/Vasily Fedosenko 

An urinal filter designed in the likeness of a soccer field with a goal post and a ball is pictured in a men's room of a public toilet in Shanghai, China July 10, 2018. REUTERS/Aly Song 

Sharks are seen at the Kalibaru district in Jakarta, Indonesia, July 10, 2018. REUTERS/Beawiharta 

A butterfly stands on the mud outside Tham Luang cave complex, where 12 schoolboys and their soccer coach are trapped inside a flooded cave, in the northern province of Chiang Rai, Thailand, July 7, 2018. REUTERS/Tyrone Siu TPX IMAGES OF THE DAY 

A butterfly stands on the mud outside Tham Luang cave complex, where 12 schoolboys and their soccer coach are trapped inside a flooded cave, in the northern province of Chiang Rai, Thailand, July 7, 2018. REUTERS/Tyrone Siu 

A fishing net from Panagiotis Pagonis' boat "Katerina" floats off the shore of Asprovalta, Greece, June 11, 2018. REUTERS/Alexandros Avramidis SEARCH "AVRAMIDIS FISHING" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY? 

A dog plays during a warm spell in Bala Lake, Wales July 1, 2018. Reuters/Andrew Yates 

A woman holds rice saplings as she plants them in a paddy field a day ahead of National Paddy Day, also called Asar Pandra, that marks the commencement of rice crop planting in paddy fields as monsoon season arrives, in Bhaktapur, Nepal, June 28, 2018. REUTERS/Navesh Chitrakar 

A man jumps into the sea at Salthill beach during sunny weather in Galway, Ireland June 26, 2018. REUTERS/Clodagh Kilcoyne TPX IMAGES OF THE DAY 

A man jumps off a diving board on Salthill beach during sunny weather in Galway, Ireland June 26, 2018. REUTERS/Clodagh Kilcoyne 

A man jumps into the sea at Salthill beach during sunny weather in Galway, Ireland June 26, 2018. REUTERS/Clodagh Kilcoyne 

A man jumps into the sea at Salthill beach during sunny weather in Galway, Ireland June 26, 2018. REUTERS/Clodagh Kilcoyne 

Pamir, an 11-year-old Tien Shan White Claw bear, is sprayed with water to cool down on a hot summer day with the air temperature at about 35 degrees Celsius (95 degrees Fahrenheit) at the Royev Ruchey zoo in the suburb of Krasnoyarsk, Russia June 26, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY 

A man with an umbrella is seen through a car window covered with raindrops as he walks on the streets of Skopje, Macedonia June 25, 2018.REUTERS/Ognen Teofilovski 

A ferry crosses the Mekong river during a heavy rain, in Phnom Penh, Cambodia, June 25, 2018. REUTERS/Samrang Pring 

Aurora, an eight-year-old female polar bear, eats a trout in a pool during a hot summer day at the Royev Ruchey zoo in Krasnoyarsk, Russia June 21, 2018. REUTERS/Ilya Naymushin 

A resident throws water at his house on fire at a residential neighbourhood of an informal settlement, in Muntinlupa, Metro Manila, Philippines, June 4, 2018. REUTERS/Erik De Castro SEARCH "PHILIPPINES FIRE" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. TPX IMAGES OF THE DAY 

A polar bear plays with a ice block filled with apples on a hot day at an amusement park in Yongin, South Korea, June 21, 2018. REUTERS/Kim Hong-Ji 

A polar bear tries to catch a fish thrown by a zookeeper on a hot day at an amusement park in Yongin, South Korea, June 21, 2018. REUTERS/Kim Hong-Ji 

A fisherman stands in the waters of the Yenisei River in the Siberian city of Krasnoyarsk, Russia June 15, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY 

A fisherman stands in the waters of the Yenisei River in the Siberian city of Krasnoyarsk, Russia June 15, 2018. REUTERS/Ilya Naymushin 

Horse Racing - Derby Festival - Epsom Downs Racecourse, Epsom, Britain - June 2, 2018 A horse is cooled down after the race Action Images via Reuters/Andrew Boyers TPX IMAGES OF THE DAY 

A woman wearing flip-flops walks through puddles during heavy rain in central London, Britain, May 29, 2018. REUTERS/Peter Nicholls 

A woman walks with a girl along a flooded road in the heavy rains in Malwana, Sri Lanka May 23, 2018. REUTERS/Dinuka Liyanawatte 

A Congolese man washes his hands as a preventive measure against Ebola in Mbandaka, Democratic Republic of Congo May 19, 2018. REUTERS/Kenny Katombe 

Demonstrators are hit by water cannon used by riot police during a rally demanding an end to sexism and the gender violence in the education in Valparaiso, Chile May 16, 2018. REUTERS/Rodrigo Garrido TPX IMAGES OF THE DAY 

Demonstrators take cover as they clash with riot policemen during a rally demanding an end to sexism and the gender violence in the education in Santiago, Chile, May 16, 2018. REUTERS/Ivan Alvarado 

Demonstrators are hit by water cannon used by riot police during a rally demanding an end to sexism and the gender violence in the education in Valparaiso, Chile May 16, 2018. REUTERS/Rodrigo Garrido 

Demonstrators are hit by water cannon used by riot police during a rally demanding an end to sexism and the gender violence in the education at Valparaiso, Chile May 16, 2018. REUTERS/Rodrigo Garrido 

Footprints are seen on wet ground as volunteers arrive for a recovery mission after a dam burst, which unleashed water at nearby homes, in Solio town near Nakuru, Kenya May 10, 2018. REUTERS/Thomas Mukoya 

Demonstrators take cover from a jet of water during a rally commemorating May Day in Santiago, Chile May 1, 2018. REUTERS/Ivan Alvarado 

Demonstrators take cover during a rally commemorating May Day in Santiago, Chile May 1, 2018. REUTERS/Ivan Alvarado 

Hail falls on a street during rain in Mexico City, Mexico April 28, 2018. REUTERS/Henry Romero 

A military serviceman marches in the rain during an Anzac Day parade in Sydney, Australia April 25, 2018. REUTERS/Edgar Su TPX IMAGES OF THE DAY 

A contingent marches past a dog during an Anzac Day parade in Sydney, Australia April 25, 2018. REUTERS/Edgar Su 

A military serviceman marches in the rain during an Anzac Day parade in Sydney, Australia April 25, 2018. REUTERS/Edgar Su 

People gather near fountains of water as they cool off at the Miroir d'Eau (Mirror of Water), in Nantes as unusually high temperatures hit France, April 20, 2018. REUTERS/Stephane Mahe TPX IMAGES OF THE DAY 

A plastic container is filled with water from a tap in Kawangware district of Nairobi, Kenya April 18, 2018. Picture taken April 18, 2018. REUTERS/Njeri Mwangi 

Aurora, an eight-year-old female polar bear, swims in a pool which was recently filled with water after the winter season, at the Royev Ruchey zoo in the suburb of Krasnoyarsk, Russia April 16, 2018. REUTERS/Ilya Naymushin TPX IMAGES OF THE DAY 

Ducks are seen on the edge of the central canal in Indianapolis, Indiana April 14, 2018. REUTERS/Zohra Bensemra 

Ducks perch at the edge of the central canal in Indianapolis, Indiana April 14, 2018. REUTERS/Zohra Bensemra 

A girl practices yoga on the banks of Lake Ohrid in Ohrid, Macedonia April 12, 2018. REUTERS/Ognen Teofilovskii 

A girl practices yoga on the banks of Lake Ohrid in Ohrid, Macedonia April 12, 2018. REUTERS/Ognen Teofilovski 

A miner washes gold at Makala gold mine camp near the town of Mongbwalu in Ituri province, eastern Democratic Republic of Congo, April 7, 2018. Picture taken April 7, 2018. REUTERS/Goran Tomasevic 

A harp that is held by an image of Saint Cecilia, patron of musicians, is pictured inside a showcase at Garibaldi square in Mexico City, Mexico April 4, 2018. REUTERS/Edgard Garrido 

A musician holds a double bass at Garibaldi square in Mexico City, Mexico April 4, 2018. REUTERS/Edgard Garrido 

A man shelters from the rain under the umbrella as he pulls his cart loaded with garbage on a street in Sao Paulo, Brazil March 28, 2018. REUTERS/Nacho Doce 

People and officials attend a gathering, organised by the Union of French Jewish Students (UEJF), in memory of Mireille Knoll, in Strasbourg, France, March 28, 2018. Mireille Knoll, 85, was found dead with 11 stab wounds at her apartment in a working-class district of Paris on Friday. The apartment was set ablaze after the attack and her body badly burnt. Police suspect that Knoll's Jewish religion was a motive for the killing. REUTERS/Vincent Kessler 

Men dressed as demons participate in a ceremony known as Los Talciguines, as part of religious activities to mark the start of the Holy Week in Texistepeque, El Salvador, March 26, 2018. REUTERS/Jose Cabezas 

A dog is pictured at a flooded area in Shkodra, Albania March 22, 2018. REUTERS/Florion Goga 

A gull is pictured at the shore beside Soumbedioune fish market in the capital Dakar, Senegal March 13, 2018.REUTERS/Zohra Bensemra 

A beaver is seen in a channel in Republican landscape reserve "Naliboksky" near the village of Rum, Belarus, March 7, 2018. REUTERS/Vasily Fedosenko