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there are no smartest animal because smart animals are smart in they’re own way. There are no animal that can be so intelligent. They are smart in their own way.

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The reason why we think that this is smart 

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The reason why we think that this is smart 

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Crows brains are relatively giant and they have been compared to the size of human thumbs, which if you compare with the body of the crow, is massive. And they also have an enlarged forebrain. (The corvid forebrain is what houses the avian analogues to the human prefrontal cortex, the area that's the powerhouse for human cognition and problem solving.

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Although crows cannot read or understand languages, crows can remember symbols and react differently to each symbols. but understanding the infinitely complex combination of symbols and meanings that make up human languages is too far for them. Meaning that they can only remember simple symbols.

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An experiment from the 1950’s shows some evidence that crows could count numbers.

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https://youtu.be/EZSk7oCNaHg

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https://www.google.co.id/amp/s/www.atlasobscura.com/articles/crows-are-smart-but-are-they-smart-enough-to-fall-in-love.amp