In this January 27, 2015 photo, penguins walk on the shore of Bahia Almirantazgo in Antarctica. Antarctica “is big and it's changing and it affects the rest of the planet and we can't afford to ignore what's going on down there”, said David Vaughan, science director of the British Antarctic Survey. (Photo by Natacha Pisarenko/AP Photo)

Bloodthirsty by Thomas P. Peschak, Germany/South Africa — winner, Behaviour: birds. When rations run short on Wolf Island, in the remote northern Galápagos, the sharp-beaked ground finches become vampires. Their sitting targets are Nazca boobies and other large birds. The finches rely on a scant diet of seeds and insects, which regularly dries up, so they drink blood to survive. ‘I’ve seen more than half a dozen finches drinking from a single Nazca booby,’ says Tom. Rather than leave their nests the boobies tolerate the vampires, and the blood loss doesn’t seem to cause permanent harm. (Photo by Thomas P. Peschak/2018 Wildlife Photographer of the Year)

Aerial photo taken on April 20, 2018 shows the view of advection fog above Qingdao, a coastal city in east China' s Shandong Province. (Photo by Lu Hui/Xinhua News Agency/Eyevine)

Artists perform near a Soviet-era monument during celebration of Maslenitsa, also known as Pancake Week, which is a pagan holiday marking the end of winter, in Yevpatoriya, Crimea on March 14, 2021. (Photo by Alexey Pavlishak/Reuters)

Pakistani civil society activists release lanterns into the sky in Lahore on December 15, 2016, as they pay tribute to victims on the second anniversary of an attack on The Army Public School in the city of Peshawar. Taliban militants attacked on Pakistani Army Public School in Peshawar, killing 151 people mostly children on December 16, 2014. (Photo by Arif Ali/AFP Photo)

A man uses a snow blower to clear a sidewalk during a winter storm ahead of the Christmas Holiday outside the Union Station, in Chicago on December 22, 2022. More than 2,200 flights were canceled across the United States by Thursday afternoon as a massive winter storm named Elliot upended holiday travel plans with a triple threat of heavy snow, howling winds and bitter cold (Photo by Kamil Krzaczynski/AFP Photo)

Aerial view of Taxodium Distichum in full blossom at a maze area of a wetland park on January 6, 2023 in Xiamen, Fujian Province of China. (Photo by Wu Wei/VCG via Getty Images)

Vietnam’s Son Doong cave, the largest in the world, could hold a 40-story skyscraper inside. The pristine ecosystem has its own river and jungle. Despite its size, Son Doong wasn’t discovered until 1991. It was lost again for nearly two decades and was fully explored for the first time in 2009. (Photo by Jason Speth/HuffPost)