I've never had it, but I have a soft spot in my heart for ducks. Well, it's either that or some cancer, not sure yet. Ducks don't deserve to become foie gras though.
The same could be said about other animals we consume everyday. It's the circle of life.
Fois gras is an intentional fattening of the duck's liver.
Bacon is an intentional fattening of the pig's belly.