Hindquarters of a mare. Close to foaling time, the muscles around the mare's tailhead will begin to relax.
More info:http://www.extension.org/pages/10035/horse-behavior-at-foaling-time
Photo source: Kathy Anderson, University of Nebraska.
Scoring:
+ 11 😊 Best + 14 🙂 Good + 12 😐 OK + 12 🙁 Unsure + 11 😞 Bad