Two books that I really enjoyed in the last couple of years were "Goodbye to a River", by John Graves, and "On the Wing (to the edge of the earth with the peregrine falcon)" by Alan Tennant.  Both moved me in different ways.  I suspect that some readers of this site might find them interesting.
Goodbye to a River is about the author's last paddle down the Bravos river before it was dammed in numerous places in the 50s.  The author is full of local lore concerning both the early indigenous people, and the settlers that replaced them, and has a flair for story telling.  It is his farewell, both to a river he grew up on and to the cultures of the land that surrounds it.  It's a good one.
On the Wing is about tracking migratory peregrines but is also a good story about a 'rogue' scientist and an aging pilot as they attempt to tag and track these amazing birds.  (Okay, I admit it, I've been a peregrine junkie since I was small).  Tennant is a good enough author to keep the story moving fairly well, but it's the information he conveys that drives the story.  The science of tagging and tracking birds of prey, the difficulties and mysteries of tracking a migratory species, the oblivious destruction the human race is capable of doling out to our fellow earthlings and the classic "pursue your life's path or a relationship" choice...how can you go wrong with material like that!  But seriously, a good book, especially if you are a raptor fan.
I didn't go through the bookshelf before I wrote this, so if this is old news, forgive me.