A Sadhu or a Hindu holy man carrying his pet monkey walks after taking a dip at the confluence of the river Ganges and the Bay of Bengal on the occasion of “Makar Sankranti” festival at Sagar Island, south of Kolkata, India, January 14, 2017. (Photo by Rupak De Chowdhuri/Reuters)

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)

A thirty-year-old Dutch demonstrator displays a sign that reads: “Glad to be Gay” during a gay people march in Frankfurt, Germany on Saturday, July 28, 1979 which ended a week long homosexual meeting. Hundreds of homosexual converged for a week of movies, theater, rock concerts and workshops on gay rights. (Photo by Rolf Boehm/AP Photo)

The Arizona Cardinals cheerleaders perform during the second half of an NFL football game against the Indianapolis Colts, Saturday, December 25, 2021, in Glendale, Ariz. (Photo by Ross D. Franklin/AP Photo)

A Secret Service police officer wrestles a protester to the ground after she ran towards a motorcade on its way to the LA Convention Center where North and South American leaders are gathered for the ninth Summit of the Americas in Los Angeles, June 8, 2022. (Photo by Apu Gomes/AFP Photo)

American rapper Megan Jovon Ruth Pete, known professionally as Megan Thee Stallion dresses as Sailor Moon in Japan in the second decade of August 2022. (Photo by theestallion/Instagram)

Women wearing traditional attire take a selfie as they practice the Garba, the traditional dance of Gujarat state, ahead of Navratri in Ahmedabad, India, Tuesday, September 20, 2022. The Hindu festival of Navratri, or nine nights, will begin Sept. 26. (Photo by Ajit Solanki/AP Photo)

Fish-eye lens with a twist: the Norwegian photographer Brutus Ostling uses bait to lure a herring gull for a close-up in September 2022. (Photo by Brutus Ostling/Solent News)