The Genius Within: Discovering the Intelligence of Every Living Thing, by Frank T. Vertosick, Jr.
A very interesting book so far. He argues that how we define intelligence and how we relate to the world is wrong. Ants, he says, are intelligent. So are bacteria. Why are tuna canned rather than dolphins? Where is the intelligence line in the sand, at which point we say "Ok, it's dumb enough to not care about killing it"? He doesn't argue that, say, an ant has the same level of intelligence as us, just that they are intelligent in their own way (his working definition of intelligence being: "the general ability to store past experiences and to use that acquired knowinge to solve future problems"). He's not a scientist (e.g. biologist) by profession, but a surgeon. His writing seems quite engaging to me (though I've found that my opinion on such things is often not shared).