I have a 1 1/2 year old hen Pekin duck that was fine up until about 2 weeks ago....somewhere around November 2, 2010. She has always been feisty and happy and followed us around. For some reason she has stopped egg laying but eats just fine. She has been resting more than usual. Her poop and appetite appears normal but she just doesn't act like she feels good. Anything I should look for? I am quite puzzeled and worried.