Over 80% of hummingbird species require forested habitats to fulfill a life history component. Forested habitats are not static and are affected by a variety of direct and indirect influences. The natural resources that comprise these habitats also have commercial value. Resources such as timber, firewood, clean water, minerals, game and fish, berries, mushrooms and many others are commonly harvested from the land and contribute to the constantly changing environment of these habitats.
Other influences are less obvious or direct, but also contribute to changing environments. Stressors such as wildfire, ground water pumping, insect or disease outbreaks, invasive species, and chemical pollution also contribute to changes in forested habitats.