They already exist, they're called 'geese'. In China for centuries flocks of geese have been trained to eat weeds, and not food crops. Children would drive them through fields on regular schedules. I think tractors and glycophosphate are used exclusively on the large farms, but I'd be surprised if the smaller farms didn't still use them.
Source: http://rss.slashdot.org/~r/Slashdot/slashdotScience/~3/TcDenrsRIMc/story01.htm
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