The first link.................can you say photoshop? (Of course, some of the gruesome real shots are just of conjoined twins)
The second link, was referring to duck hybrids (duck breed x duck breed). That's the same as the various mutt chicken threads.
I don't believe a chicken x duck hybrid would be viable. I used to have three male geese and one female duck, they took their frustrations out on the poor girl every chance they got.
I've seen a youtube video of a bantam rooster breeding a soccerball. I think testosterone will cause them to try anything that looks vaguely like an object of their affections (or should we say lust?).
Deb