Narrative

North America (Nearctic Region) usually includes most of the United States, Alaska, and Canada. The northern portion of this range is the Arctic Tundra which supports only a limited number of species. It is considered north of the tree line beyond which no trees grow. The southern portion of this range includes the dry and hot areas of Arizona and the humid and hot areas of Florida. Most of the area lies between these two extremes and is either woodland or else the Great Plains of the central United States and Canada.

Taxonomy

References