Long-tailed macaques practice good dental hygiene, researchers found when they followed a troupe around a coastal village on Great Nicobar Island in the eastern Indian Ocean, New Scientist reports. The primates keep their teeth clean with improvised floss—bird feathers, coconut fibers, blades of grass, nylon thread—and are the third macaque species found to do so. To get the most of their tools, the monkeys even plan ahead by tearing apart nylon threads before using them. Flossing is just one of the ways our evolutionary cousins use tools effectively, the researchers report in Primates.
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