Wolves are brought into the park

Deer began avoiding certain areas of the park

Those areas began to regenerate

Bushes were restored

Bear population began rising
due to more berries on bushes

Trees and forests were restored

Birds began returning

Beavers began returning

The habitats they made provided habitats
for otters, muskrats, fish, reptiles and amphibians

Stabilized the rivers and caused it to
have less erosion so that the trees
collapsed less

Less soil erosion because the vegetation
became more stabilized

Number of rats and mice began to rise

More hawks, weasels, foxes
and badgers came