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Photos from Grasslands National-Park on 2007may25:

-- here is more info on Black-tailed Prairie Dogs;
-- knowing nothing about cacti, I'm seeking help with identifying the cactus plants in these photos; the likeliest candidates being Opuntia polyacantha (plains prickly-pear-cactus) or Escobaria vivipara (pincushion cactus);
-- thanks to Chet Neufeld, the blue-flowered plant has been corrected from Lance-leaved lungwort=Mertensia lanceolata to Waxleaf penstemon=Penstemon nitidus; and the yellow-flowered plant from Shining arnica=Arnica fulgens to Colorado rubberweed=Hymenoxys richardsonii.

Photos from highway north of Grasslands-Park on 2007may25:

Photos from Blumenhof-SK on 2007may25:

Photos from Chortitz-SK on 2007may25: