In this undated photo made available by journal Nature on January 15, 2014, a northern bald ibis (Geronticus eremita) flies in Tuscany, Italy. A new study released Wednesday, January 15, 2014 says the birds choreograph the flapping of their wings, getting a boost from an updraft of air in the wake of the flapping wings by flying behind the first bird and off to the side. When a flock of birds take advantage of these aerodynamics, they form a V. (Photo by Markus Unsöld/AP Photo)

Liu Chunxia, a supporter of Xu Zhiyong, one of China's most prominent rights advocates, is detained by policemen while she gathers with other supporters nearby a court where Xu's trial is being held in Beijing January 22, 2014. When dozens of activists unfurled banners across the country last March and April calling for officials to disclose their assets, they did so at the urging of one of China's most prominent rights advocates, Xu Zhiyong. Xu, 40, stands trial on Wednesday on a charge of “gathering a crowd to disturb public order” punishable by up to five years in prison. His case will almost certainly spark fresh criticism from Western governments over Beijing's crackdown on dissent. (Photo by Kim Kyung-Hoon/Reuters)

Japanese college students look at cheerleaders during a job-hunting rally in Tokyo January 29, 2014. According to the rally organizers, about 1,500 students from vocational schools attend the rally to boost their morale ahead of their job hunt. (Photo by Yuya Shino/Reuters)

U.S. Capitol Police with guns drawn stand near a barricaded door as protesters try to break into the House Chamber at the U.S. Capitol on Wednesday, January 6, 2021, in Washington. (Photo by Andrew Harnik/AP Photo)

A dog plays amid a heavy snowfall in Madrid on January 9, 2021. Heavy snow fell across much of Spain, leaving huge areas blanketed in white as Storm Filomena brought wintry weather not seen in decades to the Iberian peninsula. (Photo by Benjamin Cremel/AFP Photo)

People react as the body of a relative is retrieved from the ruin of a building at an area affected by an earthquake in Mamuju, West Sulawesi, Indonesia, Friday, January 15, 2021. A strong, shallow earthquake shook Indonesia's Sulawesi island just after midnight Friday, toppling homes and buildings, triggering landslides and killing a number of people. (Photo by Yusuf Wahil/AP Photo)

A farmer runs behind a police officer during a protest against farm laws introduced by the government, in New Delhi, India, January 26, 2021. Tens of thousands of farmers drove a convoy of tractors into the Indian capital as the nation celebrated Republic Day on Tuesday in the backdrop of agricultural protests that have grown into a rebellion and rattled the government. (Photo by Adnan Abidi/Reuters)

Elizabeth Svensson (right), 35 and Klaudia Zakrzewska, 27, from London, arrive back in the UK at Heathrow Terminal 2, after being on holiday in Dubai for 15 days, during England's third national lockdown to curb the spread of coronavirus on Friday January 29, 2021. (Photo by Yui Mok/PA Images via Getty Images)