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Gray Wolves

Successfully reintroduced to Yellowstone in 1995, after a 70-year absence.

 

This grand ecological experiment triggered a trophic cascade, resulting in more ducks.

 

Wolves thin the elk population, allowing more saplings to grow to maturity, providing more wood for the beavers, making more wetland for the ducks, and shading the river for trout populations.

 

The wolves are a keystone species in this ecosystem.

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Taken on June 27, 2010