I have seen a Discovery Channel video of a bird throwing stones in a pot to raise the water level so it is able to reach and drink it.

A similar experiment in this paper from Current Biology shows the same phenomenon under controlled conditions, and is documented in this video.

This clearly illustrates how intelligent these animals are may well be more intelligent than many mammals. For example, the regular domestic dog will definitely not push stones in a bucket of water to quench his thirst.

How did crows, and perhaps birds in general, became so intelligent, and even more intelligent than many mammalian species?

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    $\begingroup$ Birds are animals and, as far as I know, there is no basis for your claim that they are the most intelligent. $\endgroup$ – canadianer Mar 19 '15 at 2:37
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    $\begingroup$ Using a movie scene as an example is not an accurate form of asking a question. However, I have indeed seen documentaries detailing how intelligent crows are. I suggest you youtube it and find a suitable documentary clip. $\endgroup$ – The Last Word Mar 19 '15 at 4:38
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    $\begingroup$ I edited your question as I was expecting it to be put on hold. I voted to re-open as I like the question, but I am afraid it may be too vaguely defined. Give it a thought how to improve it and make it more approachable for folks here. $\endgroup$ – AliceD Mar 19 '15 at 12:49
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    $\begingroup$ You should really define what you mean by intelligent... for instance a dog can bring you the newspaper, which a bird can't do. $\endgroup$ – nico Mar 19 '15 at 18:34
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    $\begingroup$ The basic raise-the-water-level experiment described in this paper has been subsequently repeated and extended with a number of corvid species and also with human children; it is known as the Aesop's Fable Paradigm. $\endgroup$ – Corvus Mar 20 '15 at 7:00

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