WASHINGTON, June 23 (Reuters) - Those cheery-sounding chirps coming from the tree in the back yard are carrying more than a joyful message -- they are conveying surprisingly complex information about lurking predators, biologists reported on Thursday. Tiny chickadees, known for their scolding calls, communicate details about nearby predators, biology PhD student Chris Templeton of the University of Washington found. For instance, the final, or "D" note in a call can be repeated for emphasis, Templeton said.

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