Here are pictures that are not typical to the region any more. These are the prairies, nowadays preserved only in a few nature reserves. One of those reserves is in Pipesone, where the Indians quarry the red stone for their peace pipes. A peace pipe is holy, one has to pray while quarrying the stone for it, hence the pieces of cloth which Indians attach to trees when they pray.
Prairies were grasslands, not getting enough rain to grow trees. Only in sheltered and well watered river valleys trees could grow.
Once there were innumerable herds of bison grazing on the prairies. Nowadays those nature reserves keep little herds as well.
