Why monkeys pick each others hair

This video explains Why monkeys pick each others hair (fur)or why monkeys groom each others hair in 90 secs
There are two main theories that explain why monkeys pick groom each other. When hairy animals groom each other, it is termed allogrooming. The first theory is that allogrooming is about pest removal and personal hygiene. Apes and monkeys (and lots of other animals) clean each other of dead skin, dirt and other debris, and especially parasites like ticks, fleas, and lice. One study of Japanese macaques (also called snow monkeys), found that what the monkeys were picking off each other were lice and lice eggs, which the cleaners then generally ate. Find out more in the video
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