Michael Tennesen writes in Scientific American tha... ...hey have have concepts of relative quantities: Elizabeth Brannon of Duke University has conducted similar experime... ...onkeys knew it was less than two or one, conclude Brannon and her colleagues in the May Journal of Experime... ...of Experimental Ps...
https://www.neatorama.com/2009/09/25/animals-that-can-count/
Animals That Can Count...
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