A male chimpanzee named Szymon celebrates his 40th birthday at Warsaw Zoo in Warsaw, Poland, Sept. 5, 2025. (Photo by Jaap Arriens/Xinhua)
A male chimpanzee named Szymon celebrates his 40th birthday at Warsaw Zoo in Warsaw, Poland, Sept. 5, 2025. (Photo by Jaap Arriens/Xinhua)
A male chimpanzee named Szymon celebrates his 40th birthday at Warsaw Zoo in Warsaw, Poland, Sept. 5, 2025. (Photo by Jaap Arriens/Xinhua)