In ecology, overgrazing occurs when plants are exposed to grazing for too long, or without sufficient recovery periods. It is one cause of desertification and erosion. Overgrazing is also seen as one cause of the spread of non-native plants.
... 18 to 24, 22.3% from 25 to 44, 28.7% from 45 to 64, and 28.1% who are 65 years of age or older. The median age is 50 years. For every 100 females there are 86.7 males. ...