Pelvic bones

As I took a short cut through one of the younger blocks of conifer mosaic on my way to Mogshade Hill, I stumbled across a greening pony skull. If you walk off the tracks and through the woods enough it's not uncommon to come across disarticulated bones around the forest.  About 6m from the skull were the 2 pelvic bones, again, not uncommon for the bones of fallen animal to be scattered. Though these bones were weird, these had definitely been purposefully positioned, I'm certain this isn't how they were left via natural process. There was symmetry in their placing.   On closer inspection, the needle litter in area encompassed by the positioned bones had been notably compressed, something had sat/been placed there for some time, and recently. I wonder what the motivation for these acts was. Of course, the positioning of the bones, and the episode compression may represent different events. You 'll often come across something out of the ordinary out in the forest. Still, what's it all about.  Riddle me that?