As a sufferer of Attention Deficit Ooooh Shiny!, I empathize with Montgomery's lack of focus. Birds offer so many tempting tangents that it's hard to know where to stop. Reading other reviews, I imagined Birdology being like a more focused version of one of John McPhee's collections: eclectic, but with an underlying unity. Still, it sounds like a good choice for someone with a casual interest in birds, who wouldn't be likely to read a whole book dedicated to pigeons, parrots, falconry, chickens, etc.