Speciesism Predicts Prejudice Against Low-Status and Hierarchy-Attenuating Human Groups

A growing body of evidence demonstrates that attitudes toward nonhuman animals correlate with attitudes toward disadvantaged human groups. It has been suggested that the connection rests in the ideology of social dominance. Endorsement of social hierarchy and intergroup domination is thought to extend to both human intergroup and human– animal contexts. The present research tested this reasoning by examining the scope and basis of the relation between speciesism and human inter-group attitudes. It was hypothesized that speciesism would predict less positive attitudes toward low-status groups (e.g., disadvantaged ethnic minorities) and those who support social change (e.g., feminists) but that it would be uncorrelated with attitudes toward stigmatized groups that are unmarked by social status (e.g., atheists). Two studies (Study 1, n = 98; Study 2, n = 82) tested this prediction using survey measures of speciesism, social dominance orientation, and attitudes toward 31 human groups including those noted above. Participants were first- and second-year university students in a mid-sized university in Ontario, Canada. As hypothesized, in both studies speciesism predicted less positive attitudes primarily toward low-status groups and groups that support social change. Further, relations between speciesism and intergroup attitudes were explained by their shared connection with social dominance orientation. These data contribute to the growing body of evidence showing links between speciesism and prejudice by illustrating that their shared emphasis on support for social hierarchy gives rise to a specific pattern of intergroup attitudes—one that supports inequality.