Yellowstone grey wolves were introduced in 1995 to the park to restore order to the ecosystem.
As soon as they were reintroduced, they got to work on the over-populated elk herds, which destroyed much of the willow stands and vegetation.
This also caused the beavers to return, with material and food to build their dams. Their dams restored the water flow to how it was, creating habitats for fish and waterlife. Songbirds also returned with the recovery of the willow, insects and seeds and nesting material.
Scavengers such as crows, ravens, bears and coyotes also bounced back, with the new opportunities from wolf-kills, rather than 'relying on winter-killed elk'.
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