Wolverine

From Yellowstone National Park:

Wolverines traverse incredible distances over harsh terrain to survive in the alpine environments of the greater Yellowstone area. Deep snow is critical to their survival. Female wolverines excavate birthing dens out of persistent, stable snow greater than 1.5 meters (5 feet) deep. It protects young while they are vulnerable and buffers cold winter temperatures. If snow comes earlier or later in the year, it may be out of sync with wolverine breeding cycles. If there is less snow, or if snow melts too soon, it may also jeopardize young wolverines’ survival. 

Many people wonder what will become of the wolverine in the future.