How did the black bear adapt to the deciduous forest?

Its roles as predator and scavenger make the black bear [Ursus americanus] important to the environment of the deciduous forest. For example, black bears hibernate through the winter. In spring, their first choices for food are the remains of animals that died over the previous winter. These dead bodies may have minerals and trace elements within them that need to be digested and eliminated in order to become part of the food chain. A well known example is the uselessness of nitrogen to plant life if it's in a form other than soluble. So as scavengers, black bears form clean up crews to clear the deciduous forest floor of the previous season's debris.

But black bears don't feed just on meat. Meat actually makes up only about 10-15% of the black bear's diet. In fact, black bears are omnivores that feed mainly on insects, plants and plant products. So as predators, black bears keep insect populations under control and in balance with the particular needs and stresses of the deciduous forest.

Additionally, as predators, they add to the forest's growth. On the one hand, they eat large amounts of tree bark in the spring. This may start a cycle of decline that ends in the tree's death. But at the same time, black bears favor berries, herbs, and nuts. In their choices of berries and nuts, they contribute to the replacement of dead and dying trees with new growth. The berries and nuts that they digest are eliminated, to germinate over wider areas than where these plant products fall. As a consequence, the deciduous forest sees the perpetuation and even expansion of its species.Black bears are extremely adaptable and show a great variation in habitat types, though they are primarily found in forested areas with thick ground vegetation and an abundance of fruits, nuts, and vegetation. In the northern areas, they can be found in the tundra, and they will sometimes forage in fields or meadows. Black bears tend to be solitary animals, with the exception of mothers and cubs. The bears usually forage alone, but will tolerate each other and forage in groups if there is an abundance of food in one area.Most black bears hibernate depending on local weather conditions and availability of food during the winter months. In regions where there is a consistent food supply and warmer weather throughout the winter, bears may not hibernate at all or do so for a very brief time. Females give birth and usually remain denned throughout the winter, but males and females without young may leave their dens from time to time during winter months.