The next story in the Charlie Armadillo - National Parks Explorer series takes Charlie to Rocky Mountain National Park (Colorado), where he and his parents dare to venture to the top of the Alpine Trail at over 12,000' elevation. Charlie dreams of spotting a big horn sheep as he challenges himself to identify the zones of the mountain - but is the alpine tundra the right place for Charlie to find his big horn? Rocky Mountain Trek to the Tundra is my 5th book (published Aug 2023).