This photo taken on May 9, 2024 shows a tram in Hexi area of Nanjing, featuring the Yangtze finless porpoise, a critically endangered species. This well-decorated tram aims to raise awareness about the species and promote the protection of the Yangtze River. (Photo/Jiang Wenchao)

This photo taken on May 9, 2024 shows a tram in Hexi area of Nanjing, featuring the Yangtze finless porpoise, a critically endangered species. This well-decorated tram aims to raise awareness about the species and promote the protection of the Yangtze River. (Photo/Jiang Wenchao)

This photo taken on May 9, 2024 shows a tram in Hexi area of Nanjing, featuring the Yangtze finless porpoise, a critically endangered species. This well-decorated tram aims to raise awareness about the species and promote the protection of the Yangtze River. (Photo/Jiang Wenchao)