The beaver is utterly familiar, forty inches long, and over a foot upright, a beaver seems like a little person with a fondness for engineering. Beavers live throughout North America. They have brown fur and large, flat tails. They are among the most skilled builders in the animal kingdom. American beavers build structures called dams that stop flowing water. These dams help create wetlands. This provides habitat for mammals, fish, frogs, turtles, birds, and ducks. Their handiwork can be seen throughout the Greater Yellowstone System.
Beavers are considered to be pests by some; scientists actually have proven that beavers are a "Keystone" species in North America. This means that beavers play a crucial role in biodiversity. Innumerable species rely either partly or entirely on beaver ponds, many of them threatened or endangered. Therefore, wherever we coexist with them, they provide the habitat necessary for supporting many other species, and protecting the web of life upon which we depend. A keystone species is a species that has a disproportionate effect on its environment relative to its biomass. Such species affect many other organisms in an ecosystem and helps to determine the types and numbers of various other species in a community. A keystone species is a species that plays a critical role in maintaining the structure of an ecological community and whose impact on the community is greater than would be expected based on its relative abundance or total biomass.
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