A keystone in an arch's crown secures ... environmentally sensitive areas. After the United States Congress passed the original Endangered Species Preservation Act in 1966, the gray wolf made ...

The gray wolf was once a "keystone species" in the western United States. Colorado voters soon will have the unique opportunity to help decide the fate of an entire species. A question on whether ...

SAN FRANCISCO— A first-of-its-kind analysis by 20 leading scientists has identified a network of 11 federally owned reserves where wolves and beavers could be restored across the western United States ...

Even planting just one keystone plant in the yard or in a container will help restore biodiversity on your property.

How many types of trees are there in the United States? A U.S. Forest Service ... It is also called a "keystone" tree species because of its importance in diverse forest ecosystems within its ...

"Without these bryophytes, peatland ecosystems cannot function effectively," stated the United Nations Convention on Biodiversity. The sea otter is a keystone species and central cog in coastal ...