Orang-utan case latest in attempts to give Great Ape family human status — all of which have failed, until now.
The move to grant an orang-utan in Argentina some legal rights enjoyed by humans could open the floodgates to thousands of similar cases.
The decision clears the way for Sandra, a shy 29-year-old, to be freed from Buenos Aires Zoo after spending her entire life in captivity.
The ruling came after animal rights campaigners filed a habeas corpus petition on behalf of the Sumatran orang-utan, who was born at a German zoo and was transferred to Buenos Aires two decades ago.
The outcome hinged on whether Sandra should be treated as a "thing" or a "person", with the Association of Officials and Lawyers for Animal Rights (Afada) arguing that she should not be treated as an object because of her intelligence and complex ways of thinking. The court agreed Sandra deserved the basic rights of a "non-human person".