Third place: the rear leg, claw and respiratory trachea of a louse (Haematopinus suis). (Photo by Frank Reiser/Nassau Community College/Nikon Small World Photomicrography 2021)

A hiker admires the view as Mt. Etna, Europe's largest active volcano, erupts in the background, in the Bove Valley of Etna Park, on the eastern slope of Mt. Etna, in Sicily, southern Italy, Sunday, July 4, 2021. Since Feb. 16, 2021, Mt. Etna has begun a series of eruptive episodes. (Photo by Salvatore Allegra/AP Photo)

A Bengal tigress who gave birth to four cubs at the Guadalajara Zoo, Jalisco state, Mexico runs at the zoo on October 5, 2021. (Photo by Ulises Ruiz/AFP Photo)

Ukraine's Viktoriia Onopriienko competes in the individual all-around qualification round during the Rhythmic Gymnastics World Championships at the West Japan General Exhibition Center in Kitakyushu, Fukuoka prefecture on October 27, 2021. (Photo by Charly Triballeau/AFP Photo)

A man holds a gun under his chin as he speaks with members of the NYPD outside the United Nations Headquarters in New York City, U.S., December 2, 2021. (Photo by Carlo Allegri/Reuters)

Aubrey Zimmermann, 9-months-old, poses for a photo with Santa at the Willow Grove Park Mall ahead of Christmas in Willow Grove, Pennsylvania, U.S. December 3, 2021. (Photo by Hannah Beier/Reuters)

Actresses from left Jurnee Smollett-Bell, Rosie Perez, Mary Elizabeth Winstead, Margot Robbie and Ella Jay Basco pose for a selfie photo upon arrival at the world premiere of “Birds of Prey” in London, Wednesday, January 29, 2020. (Photo by Joel C. Ryan/Invision/AP Photo)

Visitors are seen with giraffes on a bus at Safari Park in Kanchanaburi Province, Thailand, January 19, 2020. Kanchanaburi in western Thailand an area known for its waterfalls and caves. (Photo by Rachen Sageamsak/Xinhua News Agency/Eyevine)