The best-selling series of National Audubon Society field guide books have gone mobile, putting information about the natural world at the fingertips of Apple?s iPhone and iPod touch users. The first ...

Audubon was touting his work as definitive. He ended up with 435 bird studies in all — a lot, to be sure, but only a sampling of the species that lived in America. Kaufman, himself a bird ...

On the last Saturday of this month, Kienholz plans to walk around Homewood Cemetery counting birds as part of the Audubon Society ... every bird that they see by species,” Shema said.

We account for changes in effort by looking at an effort-weighted measure called “birds per party hour,” which divides the number of each species ... on Maine Audubon’s website ...