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Singing Sparrows

June 7, 2014

From The New York Times we learn that chipping sparrows love their neighbors, but only if they are weaklings. Male intruders can invade and take over another bird’s territory and strong invaders are usually the winners. Male chipping sparrows will form a neighborhood coalition to defend their territories, but apparently only if the intruder is weaker. And how do they know this? By the intruder’s song. If the intruding sparrow’s trill is weaker, i.e. slower, then that bird is less aggressive. A faster trill indicates a strong invader.

 

Stick to those music lessons, little chippers!

 

Click here to read the New York Times article.