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 in the "Animal Crossing" series to feature online play and was the second game to utilize Nintendo Wi-Fi Connection, with which players can visit other villages. Because players are required to exchange and register Friend Codes prior to visiting, connection to random players is not possible. Up to four players can explore the same village simultaneously. NWC can also be used to exchange items and custom-designed patterns between players, as well as receiving exclusive gifts from Nintendo while connected. "Wild World" is also compatible with its Wii successor, "". Players are able to transfer their player character from "Wild World"