Chickens are mean nasty stupid poop machines who happen to taste divine. That is their only saving grace.
Ducks on the other hand have personality. I get a little sad over the ducks "as I sort out those who are largest in size, holding my pocket-handkerchief before my streaming eyes." Doesn't stop me. But I do feel some small twinge.
We have a suburban community of chickens along a bike trail 15 or so miles from here (I used to cycle-commute through it, last residence). Somewhere in the late 80s to mid 90s somebody left some chickens there. They’re still there, and going strong.