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They had to work out how to do on their own. The behaviour quickly spread. But among the five groups with trained demonstrators, 68 to 83 percent of the birds solved the puzzles. Aplin also found that the successful groups split into two different schools, based on what their demonstrators did. It beautifully showed how a new cultural innovation—the infiltration of milk bottles—could spread among wild animals. If the pioneers learned the way of the blue-door, so did their neighbours.

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But the tradition was well-spread before scientists noticed, which meant that they could only observe what was going on.

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Aplin also found that the successful groups split into two different schools, based on what their demonstrators did. They had to work out how to do on their own. The behaviour quickly spread. Joe Henrich from the University of British Columbia, who studies cultural evolution, is less surprised.

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