A civilian trains to throw Molotov cocktails to defend the city, as Russia's invasion of Ukraine continues, in Zhytomyr, Ukraine March 1, 2022. (Photo by Viacheslav Ratynskyi/Reuters)

Performers during the New Year's Day Parade in London on Monday, January 1, 2024. (Photo by Victoria Jones/PA Images via Getty Images)

Shanshan He, of China, competes at Women's 1500 -T11 at the Stade de France stadium, during the 2024 Paralympics, Sunday, September 1, 2024, in Paris, France. (Photo by Emilio Morenatti/AP Photo)

A woman takes part in a Vodou ritual at a cemetery in the Haitian capital to celebrate the Day of the Dead in Port-au-Prince, Haiti on November 1, 2024. (Photo by Patrice Noel/ZUMA Press Wire/Rex Features/Shutterstock)

Models walk the runway during Pets Carnival on day 1 of the Jember Fashion Carnival 2025 on August 08, 2025 in Jember, Indonesia. (Photo by Robertus Pudyanto/Getty Images)

Paul Kerr was able to capture this stunning vista of the aurora australis from Canberra, New Zealand on June 1, 2025. (Photo by Paul Kerr/Hold Still Photography)

In this May 24, 2016 photo, a young boy descends the Qullqip'unqu mountain looking out at the tens of thousands of pilgrims gathered to celebrate the three-day festival Qoyllur Rit’i, translated from the Quechua language as Snow Star, in the Andean Sinakara Valley, in Peru's Cusco region. The celebration that mixes Catholic and indigenous beliefs honors Jesus as well as the area’s glacier, which is considered sacred among some indigenous people. While the native celebration is far older, the Christian part of the ritual stretches back to the 1700s, when Jesus is said to have appeared to a young shepherd in the form of another boy. (Photo by Rodrigo Abd/AP Photo)

Behaviour: Mammals category. Giant Gathering by Tony Wu, USA. Dozens of sperm whales mingled noisily off Sri Lanka’s northeast coast, stacked as far down as Tony could see. This was a congregation of dozens of social units, like a gathering of the clans. Aggregations like this could be a critical part of the whales’ rich social lives but are rarely reported. Some two thirds of the population was wiped out before commercial whaling was banned in 1986. This kind of major gathering could be “a sign that populations are recovering”, says Tony. (Photo by Tony Wu/Wildlife Photographer of the Year 2017)