In this May 1, 2016 photo, a reluctant donkey is alternately pushed and pulled and enticed with carrots toward town hall in order to be dressed for the costume competition at the annual donkey festival in Otumba, Mexico state, Mexico. Otumba was an important donkey market during Spanish colonial times, standing at the crossroads of major roads leading to Mexico City, where the beasts pulled heavy loads and carried travelers. Today, however, farmers use tractors and pickup trucks, and the donkey population is in decline. (Photo by Rebecca Blackwell/AP Photo)

With its huge eyes, comical name and diminutive size, Mark R. Smith’s image of a baby Hawaiian bobtail squid can’t help but raise a smile. A curiously endearing creature, the cephalopod is just 1.5cm across, its mantle cavity bearing more than a passing resemblance to a rather natty shower cap. But it is also a beautiful example of symbiosis – nature’s version of “I’ll scratch your back if you scratch mine” – for on the underside of the squid is a light organ which houses bioluminescent bacteria. The squid offers the bacteria protection and food, while the bacteria emit a glow – a handy trait that the squid uses to offset its silhouette, helping it to evade predators in the depths below. Mark R. Smith’s entry combines several images of a Hawaiian bobtail squid with different focus lengths to create a final picture with greater depth of field than normal. (Photo by Mark R. Smith/Wellcome Images/Macroscopic Solutions)

Residents wearing masks rest in the shade near a graffiti of a dragon, Friday, May 27, 2022, in Beijing. (Photo by Ng Han Guan/AP Photo)

Tatyana Abramova, 33, plays with her home fox Plombir at her countryside house outside Siberian city of Novosibirsk on September 12, 2020. The official start of the Soviet experiment to better understand the domestication of animals by humans began in 1959, and was initiated by geneticists Dmitri Beliaiev and Lioudmila Trout on a farm in Akademgorodok, the scientific center of excellence in Siberia. Their primary objective was to domesticate foxes, to understand how the ancestor of wolves, another canine, evolved into a loyal and loving dog. And understand what this domestication tells us about the genetic evolution of species. (Photo by Alexander Nemenov/AFP Photo)

Artist Sayna Soleimanpour performs a photoshoot in protest against the mistreatment and alienation of Turkish women based on their clothing, during a two-day curfew amid the spread of the coronavirus disease (COVID-19), on a deserted street in Istanbul, Turkey, early December 6, 2020. (Photo by Umit Bektas/Reuters)

Bodybuilders pose on stage during the Mr.001 bodybuilding competition in Mombasa, Kenya, on December 11, 2021. This bodybuilding competition was created by a former bodybuilder and its the first one to happen in the coastal city since 2015. The name comes from Mombasa's county code and currently is considered one of the biggest in East and Central Africa. The first edition brought over 200 participants from Kenya, Uganda, Tanzania, Nigeria, South Africa and Pakistan who competed in different categories including physique, bikini and figure. (Photo by Patrick Meinhardt/AFP Photo)

Abigail Doyle from St David's Holy Faith Secondary School, Greystones, modeling her Alice in Wonderland themed outfit designed for the Upcycled category of the An Taisce Green-Schools Let's Fix Fashion catwalk event in Cashel, Ireland on May 4, 2023. (Photo by Diarmuid Greene/The Irish Times)

Ma Jiaqi, 5, and her mother arrive at Beijing Railway Station for their train to Changchun of Jilin province, in Beijing, China, January 25, 2016. According to traffic police, over 2.9 billion trips will be made around China during the 40-day Spring Festival travel rush, which started on January 24. (Photo by Jason Lee/Reuters)