I have discovered a large lump on the breast of one of my hens. I got them all in November and she was about 20 weeks old. I have been wondering recently if she is losing weight as she is much slimmer than my other birds, but she looks like a leghorn and I had decided that it was just her breed. She seems happy enough and is doing 'hen-like' things and doesn't seem to be in pain when I touch the lump. She is laying daily. I had read that it might be her 'crop', but it was there at about 3 this afternoon too. I struggled to see it this morning, but will make sure I catch her otmorrow to check.