Included in this .zip archive is a ZTD file that contains the Switchgrass by Vondell @ Zoo Tek Phoenix.   To use this foliage, place that ZTD file in your Program Files/Microsoft Games/Zoo Tycoon/dlupdates folder.   This ZTD file contains information for two complimentary versions of the Switchgrass.   Switchgrass (Habitat) is habitat foliage and will count toward an animal's exhibit suitability rating, Switchgrass (Decorative) will not.   Some user-made a