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مشاهدة النسخة كاملة : Trilobites: Can Crows Make Mental Pictures of Tools?

ahlam1399
06-30-2018, 10:48 PM
New Caledonian crows were trained to seek rewards by tearing paper of a certain size, demonstrating what researchers say is quite advanced toolmaking.

أكثر... (https://www.nytimes.com/2018/06/28/science/crows-toolmaking.html?partner=rss&emc=rss)