Hi I have 2 Pekin ducks, both females who are about 6 months old. They both are laying 1 egg per day. A day ago I noticed one of them had very odd sounds coming from her belly. It literally sounds and feels like “crunching”. She acts just fine but the sound is loud and makes me worry. I saw a couple threads on here regarding this but I cannot get a clear idea of what it could be. Do I need to be concerned? Any help is appreciated!