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Disco Tony has travelled over 5,000 miles. He is grey with a yellow ring around his eyes. He is a cuckoo, but not just any cuckoo. He is one of a very special group of birds whose every move is being monitored.

Assigning an economic value to the benefits which nature provides might not always promote the conservation of biodiversity, and in some cases may lead to species loss and conflict, argues a ̽»¨Ö±²¥ of Cambridge researcher.