#gratification
Crows are highly-intelligent birds known for their problem-solving skills and ability to use tools. They can recognize human faces and hold grudges against specific individuals. They have complex social structures and can communicate with a wide range of vocalizations. Crows are also known for their playful behavior and tool manipulation.
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Video clip source: Creative Commons "Causal understanding of water displacement by a crow" By PLOS Media is Licensed under CC By 3.0. Based on a work at "https://youtu.be/ZerUbHmuY04"
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