The concept of the Anthropocene highlights humans as a collective agent whose activities degrade the environment and must be transformed to prevent further ecological harm. However, attributing such failures to humanity as a whole may evoke defensiveness, particularly among individuals high in collective narcissism, a tendency to hold an inflated yet fragile belief in the superiority of one's in-group. Across three studies involving 1,179 participants from Poland and the United Kingdom, we examined whether narcissistic identification with humanity represents a distinct form of social identification that predicts reduced concern for nonhuman animal welfare. Concern for animals was assessed through both attitudinal and behavioral measures, including lower willingness to donate to animal charities and stronger preferences for cheaper food products over costlier options that ensure animal welfare. Results consistently showed that human collective narcissism predicted decreased concern for animals beyond related psychological constructs such as national collective narcissism and human-supremacy beliefs. Mediation analyses further revealed that narcissistic identification with humanity was associated with perceiving pro-animal movements and advocacy as threats to human entitlement, which in turn predicted reduced concern for animal welfare. These findings suggest that a narcissistically inflated identification with humanity may undermine concern for other species. Understanding this defensive dynamic can inform strategies to enhance the effectiveness of pro-animal advocacy and promote a more inclusive moral engagement that extends beyond human boundaries.