The "Rantanplan's Ark" is a captivating comic set in the harsh environment of the Wild West. The story follows animal rights activist Ovide Byrde, who fights for the welfare of animals but faces resistance. When he finds himself in danger for his beliefs, Lucky Luke comes to the rescue and prevents an impending execution. With the support of Rantanplan and an unexpected rain of gold, Byrde is able to hire a crew to assist him in his mission. However, not everyone who claims to be an animal lover shares the same noble goals. This comic combines humor and thrilling adventures while offering a critical look at the challenges of animal protection in the Wild West.