Beartooth Mountains. 

Here, surviving about 8,000 feet, a tree now welcomes the change of / season, the white-bark pine. 

 

All summer these trees have been soaking up the energy of the sun, preparing for this moment. 

Now they offer the animals of Yellowstone a bumper crop of pine cones. The white-bark pine is gambling on the fact that animals now need all the food they can get before winter, and is hoping it can entice them to spread its seeds far and wide across Yellowstone. So inside the cones, it has put tasty nutritious pine nuts 

A pine squirrel.

It snacks on a few of the nuts to keep going, and then buries them one by one in a sheltered hollow beside the tree. If it hides them well and packs them carefully, they should last through the winter.