** Why do single birds dance? **
Scientists have investigated whether young and unpaired adult cranes are playing around when they put on a show.
http://www.bbc.co.uk/go/em/fr/-/nature/21944173
Scientists have investigated whether young and unpaired adult cranes are playing around when they put on a show.
http://www.bbc.co.uk/go/em/fr/-/nature/21944173
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