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So common that they are known to be a danger to wildlife (here's an article from US magazine wired that even says they are unknown in the US: https://www.wired.com/story/robot-lawnmowers-are-killing-hed... )

I don't know why they are uncommon here as lawns are just as popular as they are in other countries.

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I would guess our lawn sizes are larger on average. You have cities where there are no lawns, suburbs where they would have a use, and a lot of rural areas where the lawns are simply too large. It takes me 2 hours to mow my lawn using a riding lawnmower.

multi acre yards are not uncommon in France, Germany and Australia, for example.

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