In nonfiction, my latest favorite is The Thing With Feathers: The Surprising Lives of Birds and What They Reveal About Being Human  by Noah Strycker. I know I overuse the term but it is fascinating,
 about the behavior of birds and what they can do. Just the part about carrier pigeons is worth it. It also ties in well with  Birders: The Central Park Effect by author Jonathan Franzen, about the birdwatchers in Central Park.