One of my experienced mares foaled early this morning. When I found momma and baby, the filly was still damp and just beginning to nurse. There was no sign of the placenta in the stall and the mare appeared comfortable and happy. I checked mom and filly 2 hours later, and still no placenta. Mom and baby still appear to be fine. Nothing is protruding from the mare. I did call my vet and he confirmed my suspicion that the mare probably ate the placenta. I've not had this happen before, and was wondering how common this behavior is among mares. So, what has been your experience?