This past Sunday, 60 Minutes aired a story profiling controversial conservationist and animal activist Damian Aspinall and his quest to close all zoos and release all animals back to the wild.

Correspondent Lesley Stahl's piece posed the question of whether or not endangered animals born and bred in captivity be released into the wild?

Stahl followed Aspinall's effort to release nine of the zoo-born silverback gorillas in his care at his sprawling estate in England to the wilds of Gabon in Africa.