Sheep in Switzerland could soon be texting SOS messages to their shepherds when under attack by wolves.
A special collar will notify the shepherd if a member of the flock's heart rate increases, which tends to happen when the animal is distressed.
But the collar doesn't seem to be able to distinguish between different types of stress. Hopefully shepherds won't have to mountaineer up the Alps with a cup of cocoa and a valium every time a sheep sees an attractive ram!
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