A recent study published in the Proceedings of the National Academy of Sciences reveals that apes possess a remarkable social memory, recognizing photos of groupmates they haven't seen in over 25 years. The research team conducted experiments with chimpanzees and bonobos, showing them photographs of former groupmates they hadn't seen for months or even decades. The apes displayed a significant preference for looking at the photos of their familiar peers, with a stronger bias towards individuals with whom they had positive relationships. This long-lasting social memory in apes suggests that this cognitive mechanism has been present in our common evolutionary ancestors and laid the foundation for the emergence of human culture.
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