The male bird measures about 2.2 inches in length, which is around the same length as an AA battery. It weighs around 0.06 ounces, about the weight of a single raisin.

smallest birds — ruby-throated hummingbird, blue-grey gnatcatcher and ruby-crowned kinglets — lead the charge in returning to ...

The smallest bird in the grouse family, the white-tailed ptarmigan is ... threatening to push the treeline — and the ptarmigan — to ever-higher elevations, until there's no more room to rise. And ...