Unfortunately there is no way to make the real »foie gras« from any bird in an ethical or humane way: »Foie Gras« is French for »Fat Liver« and to produce the correct taste of this "delicacy" it is necessary to overfeed and fatten up geese or ducks in an unnatural way. No bird would voluntarily gobble down that amount of food, not even Blanca Duck.
Well said, except that in France I think you would be hard pressed to get people to agree that foie gras should be outlawed as here in America in some states. When I lived in France, there was no concern that force feeding the birds to make foie gras was unthical or inhumane. But that was 30+ years ago, so maybe attitudes have changed among the younger generations.