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Monday, November 23, 2009

Photo: Bird "Wives" Ruin Males' Songs When Females Approach


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Peruvian warbling antbird couples (above, male right, female left) harmonize to warn rival couples away from their territories. But put a single female nearby and the duet turns into a musical shouting match, a March 2009 study revealed.

Photographs courtesy Joseph A. Tobias and Nathalie Seddon, University of Oxford