The role livestock plays spreading wildlife harming weeds in the Rockies should be obvious-
Livestock–the elephant in the room when it comes to weeds. By George Wuerthner. New West.
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Weeds are of great harm to ungulates.
Rangeland cattle in particular are culprits. They cause bare patches of soil where weeds get started. They trample the seeds in. They move them to new places in their cow flops. I took this photo last year and posted it here. I think it makes the point.