A clearing is an open area within a woodland. Glades are often grassy meadows under the canopy of deciduous trees such as red alder or quaking aspen in western North America. They also represent openings in forests where local conditions such as avalanches, poor soils, or fire damage have created semi-permanent clearings. They are very important to herbivorous animals, such as deer and elk, for forage and denning activities. (source)