But humans are a keystone species..

“Human beings cannot be called a keystone species because our influence on nature is not disproportionately large compared to our abundance (population size). Our cities, roads, and technologies, however, have altered nearly every ecosystem on Earth. Because species diversity is a strong signifier for a healthy habitat, it is important for humans to understand how to preserve the greatest species diversity within remaining natural habitats. This requires knowledge of how to stabilize a high species diversity in parklands and nature preserves”

For more visit: http://www.encyclopedia.com/topic/Keystone_species.aspx

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