Scientists Sakumi Iki and Ikuma Adachi recently spent a lot of time watching monkeys scratch themselves. Self-scratching among non-human primates is known to indicate social tension and anxiety.

Baby monkeys who receive more care from their mothers develop stronger facial expression recognition skills as they grow, which could help them to navigate vital social groups more effectively.

She clarified in the comments that she used stuffing from another plush item to fill the sock monkey, which ended up as a small black and gray creation with white buttons for eyes. The video has ...

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