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:
+ 3 😊 Best + 1 🙂 Good + 2 😐 OK + 1 🙁 Unsure + 2 😞 Bad