Crows and Parrots: Who is the smartest bird?

Among high-IQ animals, the raven is the best among the birds, but there is also an outstanding species among the parrots, that is, the sheep parrot. So, which of them is the smartest? Scientists held an IQ competition for them. Raven: Can distinguish the authenticity, or the drama In the story The Crow Drinks Water, …
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