We were given some chickens from a friend one of the 11 just died tonight 3 days after we got her. She got sick this am couldn't get up for food and water, was wobbly. Tonight she started gasping then died.. No wheezy sounds till the last few minutes. My friend had another chicken die 2 weeks ago, she thought it was egg bound. Could it be something contagious that takes that long to pass on? They are in their own tractor and are away from our birds..