But these macaques lived in and around a Buddhist trying where there was abundant material for them to work with in the form of human hair and lo and behold, As scientists observed more populations of monkeys, they came to realize that flossing wasn't unique to the macaques, that the trying Japanese macaques have somehow picked up the habit too, and has even been observed a macaque populations that don't live alongside people In the absence of human hair, monkeys will floss with pretty much anything that's fibrous, from coconut husks to blades of grass to even feathers.