The Canadian province of Alberta has 438 species of birds. The northern part of the province is largely boreal forest, leading into the Great Plains in the south-east. The south-west portion of the province is generally temperate coniferous forest, bordered by the Rocky Mountains. These different ecosystems, along with the border formed by the Rocky Mountains, contribute to the diversity of birds in the province. Notably, several "eastern" and "western" pairs can be seen in Alberta, such as the eastern bluebird and western bluebird. Of the 438 species, 125 are accidentals, eight were introduced to Alberta, one species is extinct, and another is possibly extinct. (Full list...)