The central question of this chapter is whether keeping animals in captivity is morally justified. Captivity could be considered inherently wrong when animals are perceived to have an interest in liberty. I argue that this is the case to a certain extent, provided that we use a less stringent notion of autonomy than we do for humans. Next, I address two possible general moral justifications for keeping animals in captivity: (1) it is in the interest of humans to keep animals in captivity and (2) it is in the interest of the animals themselves. Whether these justifications are successful is to a large extent an empirical matter. In general, however, we could say that either animals of a specific species do not have sufficient adaptive capaci...