Definition: The largest scale biogeographic division of the earth's surface based on the historic and evolutionary distribution patterns of plants and animals.
Definition: A pinyon juniper woodland is a conifer woodland which has a tree community primarily composed of trees of the subsection Cembroides of the genus Pinus and the genus Juniperus.
Definition: Age when primary nutritional dependency on the mother ends and independent foraging begins to make a major contribution to the offspring’s energy requirements.