Sax just WONT be nice to the ducklings no matter how much time in the "acclimating pen" we give them! We leave the 4 week old ducklings in the pen all day, he sits right by it, not attacking, just nicely sitting, chatting and such. We do this for like, 5 days, they all seem ok. We let them out and he is really nice until we walk away then he attacks! As soon as we come back he lets go and backs away all nice again... He's looking like a nummy dinner if he dont get the corncob outa you-know-where pretty soon!