A man stands atop a dead whale at Ocean Beach in San Francisco, the US, on May 6, 2019. (Photo by AP)

Melina Avgerinou, caretaker at NGO Arcturos, feeds two brown bear cubs at a bear sanctuary in the village of Nymfaio, near Florina, Greece, on May 4, 2019. (Photo by Reuters)

Country House #20, ridden by jockey Flavien Prat, races to the finish to win the 145th running of the Kentucky Derby at Churchill Downs in Louisville, Kentucky, the US, on May 4, 2019. (Photo by AFP)

Dog musher Matt Scott, whose dog sled training has been affected by melting permafrost tundra, plays with his dog at the Yupik Eskimo town of Bethel on the Yukon Delta in Alaska, the US, on April 20, 2019. (Photo by AFP)

Blue Origin�s New Shepard rocket lands after its 11th test flight into space in this still image taken from video near Van Horn, Texas, the US, on May 2, 2019. (Photo by AP)

Electoral staff burn unused ballots after polling stations closed during the general elections in Boca La Caja neighborhood, Panama City, Panama, on May 5, 2019. (Photo by Reuters)

Pakistani Muslims attend an evening mass prayer session called "tarawih" to mark the fasting month of Ramadan, along the road in Karachi, Pakistan, on May 6, 2019. (Photo by Reuters)

A person holds an umbrella as people wait for a coronation procession for Thailand�s newly crowned King Maha Vajiralongkorn in Bangkok, Thailand, on May 5, 2019. (Photo by Reuters)

A girl carries food aid she received from the local charity Mona Relief, ahead of the holy month of Ramadan on the outskirts of Sana�a, Yemen, on May 5, 2019. (Photo by AP)

A missile lands as smoke rises during Israeli airstrikes in Gaza City, Palestine, on May 5, 2019. (Photo by Reuters)

This aerial picture, taken in Tirana, Albania, on February 7, 2019, shows a general view of Tirana�s pyramid, a former museum that was named after late Albanian communist dictator Enver Hoxha. (Photo by AFP)