Fans of the Brazilian heavy metal band Sepultura enjoy their showo at the main stage of Rock in Rio festival 2019 at the Olympic Park, Rio de Janeiro, Brazil, on October 4, 2019. The week-long Rock in Rio festival started September 27, with international stars as headliners, over 700,000 spectators and social actions including the preservation of the Amazon. (Photo by Mauro Pimentel/AFP Photo)

In this Thursday, October 3, 2019 photo, a female black bear sleeps with its tongue out high up in a Ponderosa pine tree near Clark Fork School in the Rattlesnake neighborhood of Missoula, Mont. The bear's cub, not pictured, was snoozing on a nearby branch. (Photo by Tommy Martino/The Missoulian via AP Photo)

Ukrainian serviceman fires with a heavy machine gun during a combat with Russia-backed separatists on the front line near Gorlivka, Donetsk Region on September 28, 2019. (Photo by Anatolii Stepanov/AFP Photo)

A woman tries to cross a flooded street as people walk on a trestle bridge during high water, in Venice, northern Italy, Friday, November 15, 2019. Exceptionally high tidal waters returned to Venice on Friday, prompting the mayor to close the iconic St. Mark’s Square and call for donations to repair the Italian lagoon city just three days after it experienced its worst flooding in 50 years. (Photo by Andrea Merola/ANSA via AP Photo)

People perform during this year's flashmob of silly walks, based on the sketch from the television show Monty Python's Flying Circus by Monty Python troup, in Budapest, Hungary, 01 April 2019. (Photo by Zoltán Balogh/EPA/EFE)

Students take photos with a giant King Kong sculptures made out straw in the northern Thai province of Chiang Mai on April 3, 2019. (Photo by Lillian Suwanrumpha/AFP Photo)

A Vietnamese cosplayer poses as police officer character from the game during the League of Legends (LOL) Mid-Season Invitational 2019 play-in group stage, in GG Stadium, Ho Chi Minh, Vietnam May 5, 2019. (Photo by Reuters/Kham)

A Chinese ethnic Lisu honey hunter holds a large piece of wax from a hive while gathering wild cliff honey in a gorge on May 10, 2019 near Mangshi, in Dehong prefecture, Yunnan province China. (Photo by Kevin Frayer/Getty Images)