Only 4 percent of America’s tallgrass prairies remains today, mostly in the Flint Hills of Kansas. The early fall brings the highest grass, which quickly turns into a scrubby yellow straw. At their peak, there were up to 60 million bison in America munching away at the 60 varieties of tallgrass. But just like the prairies, human action led to the decimation of their population. Today, only 500,000 bison remain. But the hardy bison is making its comeback at the Tallgrass Prairie National Preserve. The Bison Conservation Initiative led the…