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Scientists; gotta love'em. Monkey's didn't "accidentally make stone tools", they broke rocks. And this one: "The scientists said they aren't sure why the monkeys perform this behavior, but they did see the capuchins licking the rocks after breaking them. It's possible, the scientists wrote in Nature, that the capuchins are eating lichens or trace minerals from the rocks." I figure they can rule out the possibility the monkeys were breaking open the rocks to get to the lichens. Maybe the rocks were rounded, and the monkey just wanted to may sure there wasn't a nut inside.

Someone's train jumped the track down at "Now it seems that flakes per se may not represent what we thought they did. Capuchins pound rocks together to crack them open and lick the powdered quartz, probably to access dietary minerals. The process sends flakes flying in every direction. But the monkeys don’t use the flakes as tools; they just leave them lying about."