In the UK for years, milk came in bottles with foil caps. Great Tits, a common songbird, learned how to peck through the foil. The skill spread. But how? Researchers trained Great Tits in different ways of opening a box and re-released them. Knowledge of how to open the box spread rapidly, with most birds copying the trained bird in their group. In a follow-up study, the researchers made one method of opening the box more effective. Many birds quickly switched to the better method, suggesting the tits can stand up to peer pressure if they see there’s a better way of doing things.

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