Scratching is contagious among strangers – if you are an orangutan

For orangutans, scratching is contagious – but unexpectedly, the behaviour is transmitted more between individuals that do not know each other well

Source:
https://www.newscientist.com/article/2242533-scratching-is-contagious-among-strangers-if-you-are-an-orangutan/?utm_campaign=RSS%7CNSNS&utm_source=NSNS&utm_medium=RSS&utm_content=home