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in Oxford English Dictionary as a part of Korea-related update in 2021.

Among non-human primates

Some animals participate in behaviors similar to physical affection in humans. Called social grooming or allo-grooming, these behaviors are less common outside of primates, while other species do perform these behaviors, primates seem to spend much more time doing this compared to other animals. Some species devote as much as 20% of their day to grooming behaviors, much of which

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