And, because the humidity of the air is so low in the winter, a deciduous tree, with its unprotected leaves, would soon dry out. The leaves of evergreen trees and shrubs are protected by a thick, often waxy covering that prevents excessive water loss. Their leaves, or needles, are able to survive the winter. Meanwhile, evergreen's berries, seeds-bearing cones and needles are an important source of food for winter birds and the few mammals that venture out in the winter. Mammals, such as white-tailed deer, chipmunks and gray squirrels, feast on seeds and needles.
Hollies provide excellent shelter for many species.
Junipers and Eastern red cedars are particularly attractive to cedar waxwings, purple finches and Eastern mockingbirds. Evergreens can also help people reduce heating costs. Placed strategically around buildings, evergreen trees conserve energy by serving as a windbreak when other trees are bare. They also help to muffle sounds and reduce the noise pollution reaching a home during the winter. Evergreens are good for the soul, too.