The Economist -
5 May 2016 18:45

Not as hidden as it thinks it is HANG a collar fitted with a GPS tracker and a radio transmitter around a wild animal's neck, or simply glue such a device to its back, and you will know all the time where it is. You will not, though, know what it is up to--which is usually more interesting than its mere location. For this, you need to have someone in the field, watching and taking notes. That is expensive, needs special equipment to do at night and is impossible if the animal is underground in a...
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