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Yes, that's right. They have quite interesting calls and can make other animals do their work. Some ravens can even count.
No, crows are not. Ravens once were done a test to get to meat hanging upside down and had to do that by holding a string in a loop and climbing up slowly 6 times like this in a row. The ravens had never encountered string or meat hanging like that before and they accomplished it. Crows, however, had to try it at least 20 times before finally getting the point, and even then they couldn't reach the hanging meat.
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The European Magpie is one of the few animal species known to be able to recognize itself in a mirror test.
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Kea can solve logical puzzles, such as pushing and pulling things in a certain order to get to food, and will work together to achieve a certain objective.
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Hawks are not one of the smartest birds, they just are predatory and seem to have the best hunting skills. Some smart birds are: ravens, crows (though not as smart as ravens, but yes, smart), and bald eagles. Some people have argued, and I have watched many comments, and none of them talk about hawk being the smartest bird. African grey parrots are the smartest, and the bird right after that is a raven.
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