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Fascinating. They will eat all the good plants along with the bad so unless the intention is to clear the land, some other strategy needs to be devised. Still it's encouraging because even if they eat the good, if they are going to be all crowded out by kudzu or fast-growing invasives anyway, it still may be the right approach to clear it all.

I was surprised they will eat conifer needles, don't know about the sharp ones.

They may be doing rosarians an especially big favor in time, eating up all the multi-flora roses which are ground zero for spreading the dreaded rose rosette disease. It turns garden roses into witches' broom type growth which is reddish, possibly can be treated but best to put the infected plant in a garbage bag, dig it out, and burn it. It's a mite that drifts in the wind that spreads it.

I want some goats. I love goats' milk and saw some in the store last time I was there so may treat myself to some.

There's a link at the source article for a map of every goat in the US, a lot especially in Texas.