My hen has been sitting on numerous eggs for more than a month, I keep checking them but some just get rotten. Two I have noticed were broken open but the duckling was dead. Her nest is in the pen and I am allowing her to do her own thing .... I have her covered so she stays out of the sun ... but ... I am at a loss here. I read one of your replies that said a drake will kill a duckling I don't know if he is. Any suggestions here ... I have provided calcium and she is fed lay pellets AND lay crumble.