The questions surrounding the reintroduction of species, both avian and mammal, to areas in which they were originally found are examined with citation to the literature involving actual attempts at reintroduction, and lines of argument brought to bear on the discussion by ethicists and ecologists. It is concluded that the dangers surrounding most reintroductions are, if anything, understated, but that deep ecology or preservationist views still support such efforts, if undertaken in sound ways.