Old-growth forest

An old-growth forest is a forest that has developed over a long period of time without disturbance. Due to this, old-growth forests exhibit unique ecological features. The Food and Agriculture Organization of the United Nations defines primary forests as naturally regenerated forests of native tree species where there are no clearly visible indications of human activity and the ecological processes are not significantly disturbed.

One-third (34%) of the world's forests are primary forests.
Old-growth features include diverse tree-related structures that provide diverse wildlife habitats that increases the biodiversity of the forested ecosystem.
Virgin or first-growth forests are old-growth forests that have never been logged.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 3.0