Researchers monitor cardinals' activity by listening to songs
By Greg Kline
Sunday August 5, 2007
Heather Coit
David Enstrom, left, holds a tiny transmitter that's glued to cardinals to track their location and record their singing. He and Mike Ward, right, are reseachers with the Illinois Natyural History Survey.
Dave Enstrom can tell when sex is going on in the neighborhood by the sounds picked up from the tiny microphones he's planted on his randy subjects.
When they're doing "it," they invariably sing, whether it's really, really good or not.
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