imaginary. http://www.nature.org/ourinitiatives/regions/northamerica/unitedstates/oklahoma/placesweprotect/tallgrass-prairie-preserve.xml For more information on the Nature Conservancy's Tallgrass Prairie Preserve see the link above. http://en.wikipedia.org/wiki/Tallgrass_prairie The  tallgrass prairie  is an  ecosystem  native to  central   North America , with fire as its primary periodic disturbance. In the past, tallgrass  prairies covered a large portion of the  American Midwest ,