Crows are some of the smartest animals on the planet. They outperform many mammals and birds in intelligence tests. Just look at how this bird solves problems and gets itself treats.
In the first experiment, the bird quickly determined that stones should be thrown into a flask of water, not sand, in order to get a treat.
In a second experiment, scientists mixed heavy blocks with lightweight dummies. The crow immediately identified them and discarded them.
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In the third experiment, the crow also chose between dummies and real weights. And then she did not make a single mistake!
The final experiment was the hardest. There were two connected tubes in front of the bird, but she still had to guess before. She made a couple of mistakes, but got the point quickly.
These experiments prove once again the high intelligence of the crows.