MICHAL CIZEK via Getty Images
A two months old white tiger cub stands in its enclosure, on April 25, 2016, at a zoo in the city of Liberec, Czech Republic.
The eight-year-old female tiger, Surya Bara, gave birth to four cubs on February 25, 2016 / AFP / Michal Cizek (Photo credit should read MICHAL CIZEK/AFP/Getty Images)
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TOPSHOT - Shinda, a western lowland gorilla, holds her new born as they rest at the Zoo in Prague,on April 24, 2016.
Shinda's baby was born on 23rd April. / AFP / Michal Cizek (Photo credit should read MICHAL CIZEK/AFP/Getty Images)
Toby Melville / Reuters
U.S. F-22 Raptor fighters fly alongside a KC-135 refueling plane over European airspace, during a flight from Britain to Mihail Kogalniceanu air base in Romania April 25, 2016. REUTERS/Toby Melville
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MYTILENE, GREECE - APRIl 25: In this handout image supplied by the Office of Her Majesty Queen Rania Al Abdullah, Royal Hashemite Court, Queen Rania of Jordan meets Syrian refuges at the Karatepe municipality camp for refugees on the outskirts of Mytilene, on April 25, 2016 in Lesbos, Greece. Queen Rania has travelled to Lesbos at the invitation of the International Rescue Committee (IRC), her visit coming just over a week after that of Pope Francis. (Photo by Royal Hashemite Court via Getty Images)
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LONDON, ENGLAND - APRIL 25: Chris Evans (L) and Robert Downey Jr. attend a photocall for 'Captain America: Civil War' at Corinthia Hotel London on April 25, 2016 in London, England. (Photo by Dave J Hogan/Dave J Hogan/Getty Images)
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LONDON, ENGLAND - APRIL 25: Emily VanCamp poses at a photocall for 'Captain America: Civil War' at The Corinthia Hotel London on April 25, 2016 in London, England. (Photo by David M. Benett/Dave Benett/WireImage)
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LONDON, ENGLAND - APRIL 25: (EXCLUSIVE COVERAGE) John Singer Sargent's First World War painting 'Gassed' is prepared for transport by staff at the IWM (Imperial War Museum) on April 25, 2016 in London, England. The painting, part of the IWM's Art Collection, is going on loan to the Pennsylvania Academy of the Fine Arts in the United States of America from November 2016 to April 2017. The work will be on display in the upcoming exhibition World War I and American Art, opening on 4 November, 2016. John Singer Sargent was commissioned to contribute the central painting for the Hall of Remembrance, choosing to depict the aftermath of a mustard gas attack on the Western Front in August 1918, a scene he witnessed during a short visit to the front with the artist Henry Tonks. Mustard gas was used as a weapon causing widespread injury and burns as well as temporarily affecting the eyes. (Photo by Rob Stothard/Getty Images)
Jeremy Selwyn/Evening Standard/PA Wire
Prince Harry lays a wreath during a dawn service at the Unknown Soldier at Wellington Arch, London, to mark the start of Anzac Day commemorations in the UK.
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HANOVER, GERMANY - APRIL 25: U.S. President Barack Obama and German Chancellor Angela Merkel test virtual reality glasses at the ifm electronics stand at the Hannover Messe industrial trade fair on April 25, 2016 in Hanover, Germany. This is likely Obama's last trip to Germany as U.S. president. The Hannover Messe is the world's largest industrial trade fair. (Photo by Alexander Koerner/Getty Images)
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SALTBURN-BY-THE-SEA, ENGLAND - APRIL 25: The sun rises over the beach and pier on April 25, 2016 in Saltburn-by-the-Sea, England. Following a fine start to the day wintry showers and stronger winds are expected with temperatures dropping in many northern and eastern parts. (Photo by Ian Forsyth/Getty Images)
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SYDNEY, NEW SOUTH WALES - APRIL 25: The ANZAC day parade on April 25, 2016 in Sydney, Australia. Australians commemorating 101 years since the Australian and New Zealand Army Corp (ANZAC) landed on the shores of Gallipoli on April 25, 1915, during World War 1. Anzac day is a national holiday in Australia, marked by a dawn service held during the time of the original Gallipoli landing and commemorated with ceremonies and parades throughout the day. (Photo by Brook Mitchell/Getty Images)
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German chancellor Angela Merkel delivers a speech at the official opening ceremony of the Hanover industry Fair at the Hannover Congress Center HCC in Hanover, on April 24, 2016.
USA is partner country of the industrial fair Hannover Messe 2016 running from April 25 to April 29. / AFP / Ronny HARTMANN (Photo credit should read RONNY HARTMANN/AFP/Getty Images)
Brook Mitchell via Getty Images
SYDNEY, NEW SOUTH WALES - APRIL 25: Two up hosted by the well known Sydney drag queen Prada Clutch, at the Harbour View hotel in the Rocks on April 25, 2016 in Sydney, Australia. Two-up is a traditional Australian gambling game made popular among Australian soldiers during World War I. Once an illegal form of gambling, the game has been legalised in a few casinos in Australia and across the country in pubs and RSLs on Anzac Day. (Photo by Brook Mitchell/Getty Images)
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Nepalese Prime Minister KP Sharma Oli (C) takes part in a 'puja' during a ceremony to lay a foundation stone to rebuild a temple damaged in an earthquake at Swyambhunath stupa in Kathmandu on April 25, 2016, during an event to mark the first anniversary of the quake.
Some 9,000 people were killed in the 7.8-magnitude quake that struck April 25, 2015 and its aftershocks. / AFP / PRAKASH MATHEMA (Photo credit should read PRAKASH MATHEMA/AFP/Getty Images)
Michael Bradley via Getty Images
AUCKLAND, NEW ZEALAND - APRIL 25: A plane flies over the Auckland Museum on April 25, 2016 in Auckland, New Zealand. New Zealanders are commemorating 101 years since the Australian and New Zealand Army Corp (ANZAC) landed on the shores of Gallipoli on April 25, 1915, during World War 1. Anzac day is a national holiday in New Zealand, marked by a dawn service held during the time of the original Gallipoli landing and commemorated with ceremonies and parades throughout the day. (Photo by Michael Bradley/Getty Images)
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A Mercedes-AMG GT hangs above waitresses at the Mercedes store as part of the 'Auto China 2016' Beijing International Automotive Exhibition in Beijing on April 24, 2016.
Top global brands will be fighting it out to electrify buyers at China's premier car show opening on April 25 in the Chinese capital.
/ AFP / FRED DUFOUR (Photo credit should read FRED DUFOUR/AFP/Getty Images)
An Australian bagpipe soldier leaves the wreath-laying ceremony at the Australian National Memorial in Villers-Bretonneux, northern France, on ANZAC Day, Monday, April 25, 2016. ANZAC Day honors the men of the Australia-New Zealand Army Corps who died in World War I at the 1915 battle for Gallipoli, Turkey. It has since come to honor the sacrifices made by all service members in the Australian and New Zealand Armed Forces. (AP Photo/Michel Spingler)
In this April 21, 2016, photo, Democratic presidential candidate Hillary Clinton listens during a campaign event in Hartford, Conn. Clinton canât win enough delegates on April 25 to officially knock Bernie Sanders out of the race for president, but she can erase any honest doubts still left that she will soon be the Democratic Partyâs nominee.(AP Photo/Jessica Hill)
Damir Sagolj / Reuters
Visitors gather around the Faraday Future FFZERO1 electric concept car during the Auto China 2016 auto show in Beijing April 25, 2016. REUTERS/Damir Sagolj
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BHAKTAPUR, NEPAL - APRIL 23: Women work at a construction site in Bhaktapur on April 23, 2016 in Kathmandu, Nepal. The 7.8-magnitude earthquake struck Nepal close to midday on April 25 last year, killing an estimated 9,000 people. Reports suggest the government promised 2,000USD to affected households but has only paid out a fraction of the amount so far and an estimated 660,000 families are still living in sub-standard temporary shelter or unsafe accommodations one year later. (Photo by Paula Bronstein/ Getty Images)
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'Solar Impulse 2', a solar powered plane piloted by Swiss adventurer Bertrand Piccard, flies over the Golden Gate Bridge in San Francisco on April 23, 2016, after a flight from Hawaii, where he took off on April 21, 2016 for a non-stop three-day flight to cover about 3,760 kilometers / 2,336 miles.
== RESTRICTED TO EDITORIAL USE / MANDATORY CREDIT: 'AFP PHOTO / HO / SOLAR IMPULSE 2 / Jean Revillard' / NO MARKETING / NO ADVERTISING CAMPAIGNS / DISTRIBUTED AS A SERVICE TO CLIENTS == / AFP / SOLAR IMPULSE 2 / Jean Revillard (Photo credit should read JEAN REVILLARD/AFP/Getty Images)
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MELBOURNE, AUSTRALIA - APRIL 25: Miss Vista poses after winning Race 1, The Euroa VC's Handicap during Melbourne ANZAC Day Racing at Flemington Racecourse on April 25, 2016 in Melbourne, Australia. (Photo by Vince Caligiuri/Getty Images)
An Australian bagpipe soldier leaves the wreath-laying ceremony at the Australian National Memorial in Villers-Bretonneux, northern France, on ANZAC Day, Monday, April 25, 2016. ANZAC Day honors the soldiers of the Australia-New Zealand Army Corps who died in World War I at the 1915 battle for Gallipoli, Turkey. It has since come to honor the sacrifices made by all service members in the Australian and New Zealand Armed Forces. (AP Photo/Michel Spingler)
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A young Dinka woman stands at a cattle camp in Toch, Warrap state in South Sudan on April 24, 2016.
The camp houses over 10,000 Ankoli longhorn cattle and is supported by Veterinaires Sans Frontieres - Germany who helps the farmers with medicine and vaccines. Food security for livestock and agriculture is at a serious level in South Sudan because of last year's low rains. / AFP / CARL DE SOUZA (Photo credit should read CARL DE SOUZA/AFP/Getty Images)
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A woman rides her bicycle during the Day Without Cars in Medellin, Antioquia department, Colombia on April 22, 2016.
A municipal decree prohibits the use of private cars and motorcycles today, in an attempt to reduce pollution levels and to promote the use of public and alternative means of transportation. / AFP / RAUL ARBOLEDA (Photo credit should read RAUL ARBOLEDA/AFP/Getty Images)
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A group of Syrian rest while on the run in a forest in Macedonia after illegally crossing Greek-Macedonian border near the city of Gevgelija on April 23, 2016.
Some 50,000 people, many of them fleeing the war in Syria, have been stranded in Greece since the closure of the migrant route through the Balkans in February. / AFP / JOE KLAMAR (Photo credit should read JOE KLAMAR/AFP/Getty Images)
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ECEABAT, TURKEY - APRIL 25: Australians and New Zealanders are seen walking on second ridge road to the New Zealand Memorial service at Chunuk Bair after attending the morning's dawn service on April 25, 2016 in Eceabat, Turkey. Turkish and Allied powers representatives, as well as family members of those who served, are commemorating the 101st anniversary of the Gallipoli campaign with ceremonies across the Gallipoli Peninsula. The Gallipoli land campaign, began on April, 25, 1915 and saw a combined Allied force of British, French, Australian, New Zealand and Indian troops in an offensive to occupy the Gallipoli Peninsula and the Dardanelles Strait. The campaign lasted 8 months and cost the Allies approximately 50,000 killed and up to 200,000 wounded. (Photo by Chris McGrath/Getty Images)
Ibraheem Abu Mustafa / Reuters
A Palestinian woman collects barley during harvest on a farm in Khan Younis in the southern Gaza Strip April 25, 2016. REUTERS/Ibraheem Abu Mustafa