Wild man syndrome experiencing the condition. Some theorists believe that emotions are produced by culture and are not biological. Their emotional diversity across cultures and the way individuals think is based on their social environment and on past and future experience and expectations. Wild Pig syndrome is unusual by Western standards; however, it is common and normal in the Gururumba tribe. This syndrome got its name from the occurrence of domesticated pigs going through a temporary state in which the pig will run wild. With appropriate measures the pig can return to the domesticated pig life among the villagers. This is similar to
Animal Crossing: Wild World online oddities mentioned include the disappearance of all animal residents during the visit and the fact that North American and European players are unable to connect with Japanese players. "Wild World" producer Katsuya Eguchi stated that these limitations were due to hardware and memory constraints. On December 1, 2005, Media Create stated that "Animal Crossing: Wild World" sold 325,460 copies in Japan in its first week of availability, beating the previous mark set by "Jump Super Stars" and becoming the best-selling title for the Nintendo DS until the release of "". It was the 29th best-selling game in Japan as