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Rudolph and friends no longer need to rely on the famous reindeer's red nose to avoid getting lost.Lapland's reindeer are the main source of livelihood for about 1,500 herders, so there's high interest in technology that can help manage them.At least 5,000 reindeer are killed every year, according to the herding association.Koivisto says he loses about 8 percent of his herd annually.If a collar-fitted reindeer doesn't move after about four hours, its icon changes from green to red on the app, signaling a potential attack.The herding association has been working for years on a reliable GPS reindeer tracking system.
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