Thesis
Keeping animals in zoos can be justified by conservation, but never by education or enjoyment
Its coordinates: 3.3.2 Environmental Ethics · 3.3.6 Animal Ethics
Where it stands
Most cities have a zoo, most of us were taken to one as children, and the argument about them has sharpened over the years.
Thesis: Keeping wild animals in captivity can be justified only when it serves the conservation of their species, for instance through breeding programmes for animals at risk of extinction. Education and visitors' enjoyment are not enough.
For: captivity is a serious imposition on an animal with a life of its own to lead. Tom Regan would say such animals are subjects of a life and may not be treated merely as means. Education can be done with film; enjoyment is no reason at all. Only saving the species gives something back.
Against: this puts the bar in the wrong place. Peter Singer's question is about suffering, not captivity as such. A well-kept zoo animal may live longer and suffer less than its wild relatives. And conservation depends on public support, which depends on people seeing living animals. Education and enjoyment may be how conservation gets paid for.
There's a third position: that the thesis is too generous, because even conservation does not justify captivity for the individual animal, which never agreed to be an ambassador for its species.
Please mark your side.