For many organizations, animals are indispensable resources and without their presence these organizations would be unable to fulfill their mission and achieve their objectives. Despite this importance, organizational theory and management research have largely rejected animals outside the boundaries of the discipline. Our research focuses on the central place of animals in certain organizations that we describe as biosocial. Based on the analytical developments of boundary-work, our article makes two contributions to the emerging theory of biosocial organizations. First of all, we highlight a variety of biosocial organizations that do not pursue the same objectives and grant different status to animals. We also highlight the many externalities associated with the functioning of biosocial organizations that strain the equilibriums of the earth system and are at the root of political tensions and ethical questions. In response to the scientific and industrial developments of biosocial organizations and their societal and environmental footprints, our research highlights the need to integrate these organizations as research objects within the theory of organizations and management research. We also bring original developments for boundary-work by showing the importance of taking an interest in the boundaries of living organisms that are challenged by biosocial organizations and which lead to questioning the very notion of the human species."