In the winter time here in Virginia we get a number of differnt types of sparrows that migrate in. I love watching them but was having difficulty determining which types were which from just the regular field guides so I asked around and one of our local birders recommended this to me. Its terrific! The pictures of the birds are close-up - as if you were holding the bird or were sitting on the ground less than a foot away looking at the bird. This really helps when trying to distinguish the slight differences in colors or patterns. Each species has a chapter that strats out with measurements (size, weight etc) then there's a range map, and some text on habitat, then some text on behavior and voice/songs. There's writing about similar species, geographic variation, distribution (winter, breeding, migration periods), conservation status, and molt. There's also text descriptions for specific markings etc to hone in on, and discussion of hybrids if any. Then the chapter has pictures, of boys, girls, adults, juveniles, etc. Really a great book that has helped me a lot. I'd buy it again in a heart beat.