Black-headed gulls sit on pickets at a riverside in Tokyo, Japan, December 27, 2015. (Photo by Toru Hanai/Reuters)

Two brown bears bathe in their enclosure at the Wildpark Poing in Poing, Germany, Wednesday, August 8, 2018. (Photo by Lino Mirgeler/Deutsche Presse-Agentur via AP Photo)

Preparation of a Cuban cake (a Mexican sandwich that is made with bread, generally a telera, bolillo or baguette, which is split in half and filled with different ingredients such as milanesa, sausages, cheese, avocado, onion, tomato, bacon, chili, chorizo, pineapple, among others), during the International Cake Fair on the esplanade of the Venustiano Carranza mayor's office in Mexico City on August 2, 2023. (Photo by Gerardo Vieyra/NurPhoto/Rex Features/Shutterstock)

Visitors pose for a picture next to a mallard duck on the cobblestones of St Peter's Square with St Peter's Basilica in the background at The Vatican, on May 5, 2025. (Photo by Alberto Pizzoli/AFP Photo)

This is the moment a diver appears to shake hands with a giant 52ft whale. The divers were just metres away when one humpback whale – which weighs 36,000kg – extends its giant flipper in a peaceful manner. (Photo by Masa Ushioda/SeaPics/Solent News & Photo Agency)

A curious leopard cub toys with a camera at MalaMala Game Reserve in Mpumalanga Province, South Africa. (Photo by Barcroft Media)

“In anatomy, heterochromia refers to a difference in coloration, usually of the iris (but also of hair or skin). Although infrequently seen in humans, complete heterochromia is more frequently observed in other species, where it almost always involves one blue eye”. – Wikipedia (Photo by StooMathiesen)

An airplane passes the moon as it makes its approach to Philadelphia International Airport, Sunday, September 7, 2014, in Philadelphia. (Photo by Matt Rourke/AP Photo)