In 2012, Swiss researchers fitted sheep with heart monitors to test whether collars could detect wolf panic, trigger a repellent and text the farmer

A flock of sheep sending text messages to its shepherd sounds like an idea from a science fiction film, but in Switzerland, researchers tested a prototype system that came surprisingly close to this. In 2012, Swiss biologists fitted sheep with heart-rate monitors capable of detecting a surge in stress that usually occurs when predators approach.

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