Parrot understands concept akin to zero

A Brandeis University researcher in Massachusetts has shown that an African grey parrot understands a numerical concept akin to zero.

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<p><a href="http://www.physorg.com/news5049.html">Parrot understands concept akin to zero</a></p> <p>A Brandeis University researcher in Massachusetts has shown that an African grey parrot understands a numerical concept akin to zero.</p>