Never underestimate the power of a small black bird no more than 25cm in body length. The old saying "unity is strength" was recently verified in a backyard in southern Europe. One day, hundreds or even thousands of European starlings gathered in front of his house. They kept swirling and swarming in the air. Suddenly, they all landed on two pine trees at the same time, trying to bend and break the two pine trees. No one knows why they did this, nor who is driving them to do these things.
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