Forest interior habitat conditions generally occur 2-4 tree lengths into a stand. The forest interior is cooler, moister, shadier, and less windy than the edge. Such habitat protects plants and animals from snow, wind and freezing temperatures in winter, and extreme heat in summer. It can also provide protection from predators. Some species are specifically adapted to forest interior habitat and depend on it for their survival. This critical habitat can be maintained by keeping some large leave areas.
Edge habitat is found at the boundary between a forest and a newly harvested patch. Many species, such as deer and elk, thrive in this habitat where forage is plentiful and the protective cover of the forest is nearby. Edge habitat can be created by harvesting many small patches within an area. To balance the habitat requirements of both edge and interior species, cutblocks should be harvested in a variety of sizes to mimic a wide range of natural disturbances.