The Spanish photographer Xavi Bou digitally combines sequential pictures of birds to create a single image, or chronophotograph, that reveals the shapes of their flight paths against Catalonian skies. His work shows the variety and beauty to be found in the daily activities of the local birds, including spiralling storks, swooping starlings and giddy swifts. Here: European herring gulls at Llobregat Delta. (Photo by Xavi Bou/Rex Features/Shutterstock)

French firemen wearing chemical protective suits take part in a mock chemical attack exercise at the Geoffroy Guichard stadium in Saint-Etienne, France, April 4, 2016 in preparation of security measures for the UEFA 2016 European Championship. (Photo by Robert Pratta/Reuters)

Poland's Pia Skrzyszowska (C) wins gold in the women's 100m Hurdles final during the European Athletics Championships at the Olympic Stadium in Munich, southern Germany on August 21, 2022. (Photo by Ina Fassbender/AFP Photo)

Enthusiast dressed as zombies take part in the Zombie Walk event on September 14, 2019 in the eastern French city of Strasbourg, within the framework of the 12th edition of the European Fantastic Film festival, which runs from September 14 to 22. (Photo by Frederick Florin/AFP Photo)

Karolina Kluskova of the Czech Republic formed one part of an artistic swimming duet at the European Games at Aquatics Centre in Oswiecim, Poland on June 22, 2023. (Photo by Sarah Meyssonnier/Reuters)

A model waits backstage during a show of the third bi-annual Budapest Central European Fashion Week in Budapest, Hungary, 30 March 2019. (Photo by Zoltan Balogh/EPA/EFE)

Jourdan Dunn poses for photographers upon arrival at the MTV European Music Awards 2016 in Rotterdam, Netherlands, Sunday, November 6, 2016. (Photo by NIVIERE/SIPA Press/Rex Features/Shutterstock)

Lutricia Bock of Germany falls down as she performs during the ladies short program at the ISU European Figure Skating Championship in Bratislava, Slovakia, January 27, 2016. (Photo by David W. Cerny/Reuters)