"Choosing zoos as a means for species preservation, in addition to being expensive and of dubious effectiveness, has serious ethical problems. Keeping animals in zoos harms them, by denying them freedom of movement and association, which is important to social animals, and frustrates many of their natural behavioral patterns, leaving them at least bored, and at worst seriously neurotic. While humans may feel there is some justifying benefit to their captivity (that the species is being preserved, and may someday be reintroduced into the wild), this is no compensating benefit to the individual animals. Attempts to preserve species by means of captivity have been described as sacrificing the individual gorilla to the abstract Gorilla (i.e., to the abstract conception of the gorilla)."
