Animal corpses can spawn with their harvestable side facing a wall/tree/rock and be unobtainable.

Multiple locations I've killed a critter close to a rock, or a tree, or a wall, and when I went to field dress it, my character walks endlessly into the obstacle instead of harvesting from an open side of the corpse. A good resolution to this and also to making it so you don't have to walk around corpses/ore nodes/trees to the one spot they are harvestable from would be to impliment additional access nodes, so that you can access them from multiple directions, instead of from only the one location (less viable with trees due to the chopping down animation, I understand, but still worth mentioning as sometimes the far side of a tree won't aggro an enemy, while the near side will, and you just want to just on the far side from the enemy because it's not worth the time to fight).