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November 9 2012
Mothers usually set about teaching their offspring the moment they're born. But the females of one Australian bird can't wait that long.
Superb fairy-wren (Malurus cyaneus) mothers sing to their unhatched eggs to teach the embryo inside a 'password' — a single unique note — which the nestlings must later incorporate into their begging calls if they want to get fed. | |  |
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