A combination picture shows visitors taking pictures in front of flowing water (top) and dry cliffs following a prolonged drought (bottom) at Victoria Falls, Zimbabwe taken January 17, 2019 and December 4, 2019. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY 

Visitors take pictures before dry cliffs following a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

The Victoria Falls is seen from the air following a prolonged drought from the Zimbabwean side at Victoria Falls, Zimbabwe, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Visitors walk over a bridge as dry cliffs are seen along the parched gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Spray rises up in the distance along the parched gorge on the Zambian side of Victoria Falls, Zambia, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Dry cliffs are seen following a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings TPX IMAGES OF THE DAY 

A visitor takes pictures before flowing water at Victoria Falls, Zimbabwe, January 17, 2019. Picture taken January 17. REUTERS/Mike Hutchings 

Dry cliffs are seen following a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

Spray rises up from a flowing section as bare dry cliffs are seen after a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Visitors walk along a walkway as spray rises up from a flowing section of Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

A dry section of the Zambezi river is seen above the gorge on the Zambian side of Victoria Falls, Zambia, following a prolonged drought, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

The Victoria Falls is seen from the air following a prolonged drought from the Zimbabwean side at Victoria Falls, Zimbabwe, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Spray rises up in the distance along the parched gorge on the Zambian side of Victoria Falls, Zambia, December 5, 2019. Picture taken December 5, 2019. REUTERS/Mike Hutchings 

Visitors walk along a walkway as spray rises up from a flowing section of Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

Visitors take pictures before dry cliffs following a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

Visitors take pictures before dry cliffs following a prolonged drought at Victoria Falls, Zimbabwe, December 4, 2019. Picture taken December 4, 2019. REUTERS/Mike Hutchings 

A combination picture shows water flowing (top) and low-water levels after a prolonged drought (bottom) at Victoria Falls, Zimbabwe taken January 17, 2019 and December 4, 2019. REUTERS/Staff 

A combination picture shows water flowing (top) and low-water levels after a prolonged drought (bottom) at Victoria Falls, Zimbabwe taken January 17, 2019 and December 4, 2019. REUTERS/Staff 

Visitors walk along a walkway near Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Staff 

Visitors walk along a walkway after a prolonged drought near Victoria Falls, Zimbabwe December 4, 2019. REUTERS/Staff 

Water pours over the edge of Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Staff 

Low-water levels are seen after a prolonged drought at Victoria Falls, Zimbabwe December 4, 2019. REUTERS/Staff 

Water pours over the edge of Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Staff 

Low-water levels are seen after a prolonged drought at Victoria Falls, Zimbabwe December 4, 2019. REUTERS/Staff 

Water pours over the edge of Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Staff 

Low-water levels are seen after a prolonged drought at Victoria Falls, Zimbabwe December 4, 2019. REUTERS/Staff TPX IMAGES OF THE DAY 

Storm clouds gather as a cyclist returns with goods from the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

Storm clouds gather as cyclists return with goods from the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

Storm clouds gather as a fuel tanker drives towards the Zambian border at Victoria Falls, Zimbabwe January 17, 2019. Picture taken January 17, 2019. REUTERS/Stringer 

The golden statue of Victoria atop Berlin's Victory Column is pictured through the branches of autumn trees in Berlin, Germany, October 15, 2018. REUTERS/Fabrizio Bensch 

Princess Charlotte falls on the steps, as the bridesmaids and page boys arrive for the wedding of Princess Eugenie to Jack Brooksbank at St George's Chapel in Windsor Castle, Britain October 12, 2018. Victoria Jones/Pool via REUTERS 

Louis de Givenchy falls on the steps, as the bridesmaids and page boys arrive with Lady Louise Mountbatten-Windsor, for the wedding of Princess Eugenie to Jack Brooksbank at St George's Chapel in Windsor Castle, Britain October 12, 2018. Victoria Jones/Pool via REUTERS 

A man plays music on the waterfront while heavy rains fall on Victoria Harbour as Typhoon Mangkhut approaches Hong Kong, China September 16, 2018. REUTERS/Bobby Yip 

A man takes a photo on the waterfront while heavy rains fall on Victoria Harbour as Typhoon Mangkhut approaches Hong Kong, China September 16, 2018. REUTERS/Bobby Yip 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 2, 2018 Belarus' Victoria Azarenka reacts after falling during the first round match against Russia's Ekaterina Alexandrova REUTERS/Andrew Couldridge 

Tennis - Wimbledon - All England Lawn Tennis and Croquet Club, London, Britain - July 2, 2018 Belarus' Victoria Azarenka reacts after falling during the first round match against Russia's Ekaterina Alexandrova REUTERS/Andrew Couldridge 

Model Ming Xi falls as she presents a creation during the 2017 Victoria's Secret Fashion Show in Shanghai, China, November 20, 2017. REUTERS/Aly Song TPX IMAGES OF THE DAY 

Model Ming Xi falls as she presents a creation during the 2017 Victoria's Secret Fashion Show in Shanghai, China, November 20, 2017. REUTERS/Aly Song 

Model Ming Xi falls as she presents a creation during the 2017 Victoria's Secret Fashion Show in Shanghai, China, November 20, 2017. REUTERS/Aly Song 

Rain falls outside the British Columbia Parliament Buildings prior to BC Green leader Andrew Weaver and BC New Democrat leader John Horgan and all Member of the Legislative Assembly-elect from the B.C. Green and New Democrat caucuses pledging their support for the Confidence and Supply Agreement in the Hall of Honour in the British Columbia legislature building in Victoria, British Columbia, Canada May 30, 2017. REUTERS/Kevin Light 

Vogue editor-in-chief Anna Wintour watches a model present a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson 

A model presents a creation from the Victoria Beckham Fall/Winter 2017 collection during New York Fashion Week in the Manhattan borough of New York, U.S., February 12, 2017. REUTERS/Lucas Jackson