[PIF]

I’m guessing that deer liked to eat Aspen trees?
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an estimated 18,000 ELK ranged across the park, chomping on grasses and shrubs as well as the leaves, twigs and bark of trees like quaking aspen (Populus tremuloides). This stopped saplings from establishing themselves, and surveys in the 1990s found no aspen saplings.

[Sacajaweau]

Try forestry...Aspens have a huge dense canopy.