Indian authorities hold a tiger skin as they set fire to a stockpile of illegal wildlife parts at the Delhi Zoo in New Delhi, India, Sunday, November 2, 2014. A stockpile of tiger skins, elephant tusks, rhino horns and other illegal animal parts were burned Sunday in an effort to discourage wildlife smuggling in South Asia. (Photo by Tsering Topgyal/AP Photo)

The Northern Lights glow green in a spectacular light show above a field of trees frozen solid with snow. (Photo by Jaak Sarv/Solent News & Photo Agency)

A woman poses with a grenade launcher at a weapons exhibition during festivities marking Marines Day in St.Petersburg, Russia, Saturday, November 24, 2018. (Photo by Dmitri Lovetsky/AP Photo)

A U.S. Marine kneels beside a Multi-Utility Tactical Transport ( MUTT) during a patrol as part of Rim of the Pacific (RIMPAC) 2016 an exercise held at Camp Pendleton, California United States, July 13, 2016. (Photo by Mike Blake/Reuters)

Yeshiva School students briefly dance on Grant Street after the menorah lighting outside of the City-County Building for the fifth night of Hanukkah, Thursday, December 26, 2019, in downtown Pittsburgh. (Photo by Alexandra Wimley/Pittsburgh Post-Gazette via AP Photo)

A woman wearing a protective mask walks outside a church in Mandaluyong, east of Manila, Philippines on Sunday, February 2, 2020. The Philippines on Sunday reported the first death of a new virus outside of China, where authorities delayed the opening of schools in the worst-hit province and tightened quarantine measures in another that allow only one family member to venture out to buy supplies. (Photo by Aaron Favila/AP Photo)

A cemetery worker dig new graves at the Xico cemetery on the outskirts of Mexico City, as the coronavirus disease (COVID-19) outbreak continues in Mexico, June 10, 2020. (Photo by Edgard Garrido/Reuters)

A person dressed as the mascot of Tokyo Tower wears a face shield while waiting to greet patrons at the entrance of the 332.9m (1,092ft.) high tower on May 28, 2020, as the city's landmark reopened following the lifting on May 25 of the state of emergency, imposed due to the COVID-19 novel coronavirus outbreak. (Photo by Philip Fong/AFP Photo)