Posted AT 11:05 PM EDT on 28/03/08
The end of the road
Like most songbirds, the Swainson's thrush migrates alone and in the dark. Its nocturnal flights take it hundreds of kilometres from South or Central America to Canada each spring, then back again in the fall.
But last May, as the olive-brown birds made their way north through Illinois, a few of them had a escort: Princeton University biologist Martin Wikelski, racing after them in a 1982 Ford station wagon with a radio receiver sticking through the roof.
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