Hippo keeper Atthapon Nundee, 31, takes pictures of a two-month-old female pygmy hippo named “Moo Deng” who has recently become a viral internet sensation, at Khao Kheow Open Zoo in Chonburi province, Thailand, on September 16, 2024. (Photo by Athit Perawongmetha/Reuters)

Wefa, 13, a female Western lowland gorilla, looks inside a Christmas box that contained food as a gift, after a caretaker dressed up as Santa Claus placed it in the enclosure of the family of gorillas, at Bioparc Fuengirola, in Fuengirola, Spain, on December 21, 2024. (Photo by Jon Nazca/Reuters)

Female members of the Colombian Army take part in the military parade to commemorate Colombia's Independence Day in Bogota on July 20, 2024. (Photo by Alejandro Martinez/AFP Photo)

Female police officers, Carabineras, march during the annual military parade to celebrate Independence Day and Army Day in Santiago, Chile on September 19, 2024. (Photo by Matias Basualdo/ZUMA Press Wire/Rex Features/Shutterstock)

Female labourers wearing helmets take a break from laying underground electricity cables in Ahmedabad, India, March 7, 2016. (Photo by Amit Dave/Reuters)

A female honor guard has lipstick applied as they prepare for an official welcoming ceremony outside the Great Hall of the People in Beijing, China on June 11, 2014. (Photo by Jason Lee/Reuters)

The six-months-old female koala cub holds on to the back of zoo keeper Lena at the zoo in Duisburg, Germany, 23 October 2015. The yet unnamed baby weighs 580 grams. (Photo by Roland Weihrauch/EPA)

These macro images by Alejandro Santillana are being showcased in the Insects Unlocked project at the University of Texas at Austin. Here: A female sweat bee. (Photo by Alejandro Santillana/Insects Unlocked/Cover Images)