Sorry for getting off topic here but I have to respond to the discussion on elk.They do graze but they also browse and eat alot of the same foods deer eat.Obviously an elk is alot bigger and needs more food then a deer.It's OK for the elk to browse and destroy the habitat because it's in the name of tourism.
Here's a short clip from the PGC website,

Elk are primarily grazers, eating a variety of grasses and forbes. In winter, they paw through snow to reach grass, or turn to twigs, buds and the bark of trees. Among trees and shrubs, Pennsylvania elk seem to prefer aspen, red maple, fire cherry and blackberry. They also browse oak, striped maple, black cherry, Juneberry and witch hazel. They drink from streams and springs and, if necessary, during the winter they get water by eating snow.