ScienceDaily (2010-03-11) -- Mother birds communicate with their developing chicks before they even hatch by leaving them messages in the egg, new research has found.
http://www.sciencedaily.com/releases/2010/03/100311141209.htm
ScienceDaily (2010-03-11) -- Mother birds communicate with their developing chicks before they even hatch by leaving them messages in the egg, new research has found.
http://www.sciencedaily.com/releases/2010/03/100311141209.htm
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