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
Wild animal suffering having greater levels of cortisol and elevated stress responses relative to domestic animals. Additionally, unlike domestic animals, animals in the wild do not have some of their needs provided for them by human caretakers. Welfare economist Yew-Kwang Ng has written that evolutionary dynamics can lead to animal welfare which is worse than necessary for a given population equilibrium. In the essay 'On Nature', utilitarian philosopher John Stuart Mill wrote about suffering in nature and the normativity of struggling against it: In sober truth, nearly all the things which men are hanged or imprisoned for doing to one another, are nature's