I'm looking after a neighbor's critters and tonight one of their runner duck hens had a purple round ball surrounded by soft white tissue hanging from her backside! The neighbor's dad and I caught her and removed most of the white stuff - it looked like either egg white or membrane, it didn't seem to be attached. The round thing was hard, a little smaller than a golf ball and attached by a very thin stem. Couldn't leave her like that, she was off by herself, away from the others so we cut it off. We half expected stinky or bloody but there wasn't anything. We let her up and she ran off to join the others. It looked for all the world like a fried egg with a rotten yoke! Any ideas what this could've been? We just have our fingers crossed that she'll be alive in the morning!