I always hear about how the region is evolved for the occasional wildfire, but the area also had far more large grazers keeping the fuel in check. The under-grazing is a big part of the fire equation.
Maybe to a small degree. Grazers might keep the non native grasses and invasive weeds in check (although that has historically been the job of wildfires). Grazers aren't going to eat mature oaks, toyon and other woody natives though. The canyons near me have plenty of deer but the canyon is still overgrown and full of fuel.
