Group of the monkeys

Very interesting thing is that they like to live in groups like humans. They are clean.  That's why they always try to clean themselves from various impurities, including lice and insects, when they go to the zoo or the forest.  To live in society 

 For just as humans are held together by social bonds, monkeys are held together by forming social bonds among themselves.  Although they are wild animals, they are quite social.