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A university has published research results showing that plants emit ultrasound when they are stressed.

It is possible that animals that are sensitive to the ultrasonic waves can hear them. What I found strange about horses in pastures was that they often stayed in the same place in a large pasture, and they preferred to eat grass outside the fences.

Maybe it can distinguish between healthy grass and not so healthy grass (e.g. grass that has been trampled too much and is not healthy).