Multi-level alien contact story that is strong in every way. Written in 1959, it's far better than most of what's been written since. Why? Because it's focus is on telling a great story.
The writing stands out from most fiction because the author knows the taste, feel and truths of wilderness living. The telling effortlessly conveys the thoughts of the main character in a plain, easy way. The aliens are original and a reasonable extrapolation from known terrestrial biology. The 'warden' is yet another layer added to the mix.
Best of all, if you enjoy alien stories, this story is a total blast to read.