Auckland Zoo has been an icon of the city for nearly a century. The jewel in its crown? A pride of lions. There were once 11 mighty lions, but only two remained Kura and Amira. As these lions reached the end of their natural lives, the zookeepers faced a dilemma. Should they be euthanised? SUNDAY's cameras follow zoo staff as they face the most difficult and possibly heartbreaking decisions of their careers.