4More than 900 species of birds are known from North America, an avifauna made up of native year-round residents and seasonal migrants, modestly enhanced by introduced exotics and neighboring vagrants. Bird Is the Word is an unequalled compilation of the names of almost 800 of those birds and the record of how, when, where, and by whom those names were created and became parts of the history and science of North America's avifauna.