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Endangered Species The Northern Spotted Owl is one type out of the three subspecies of the Spotted Owl. They could be found anywhere between south of British Columbia, Canada all the way down to the southern border of Marin County, California. Biologists have estimated that there may be about 3,000 and 5,000 pairs remaining of the spotted owls existing in the wild today. These particular owls live mainly in old-growth areas of the forests, which contains trees such as the western hemlock and the redwood trees. The term “old-growth” refers to the trees in the forest that are at least two hundred years old that have not been bothered, touched, or changed in any kind of way by a person. The trees have several layers of overhanging bark on them, which represents that the trees are aged. There are 155 national forests in the United States about the size of California (Issues and Controversies). Ever since the timber industry started to cut down the forest, where most spotted owls have made their home, they have been on the Endangered Species List since 1990. It