From phys.org:

As the sun sets over the southern French Alps on a cool evening in early June, a flock of sheep huddle in an enclosure at an altitude of 1,500 metres.

Next to them, two khaki-clad watchmen settle down for the night in the Mercantour National Park on the border with Italy, equipped with thermal-vision cameras, warm jackets and a rifle with a night-vision scope.

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