Back in 2005 when I retired from the guide business, the Mulchatna caribou herd was crashing.  I had guided for them through the peak which topped out at about 250,000 caribou.  It dropped to an estimated 80,000 or so and finally dropped on down to about 60,000.  Those caribou hunts were by far the most fun hunting experiences that I have ever had and I have always wanted all of my grandchildren to have that experience.