It’s in the abstract. They’re using stones as hammer and anvil to get access to food. This isn’t news. The news is that only male monkeys were observed using r

It’s in the abstract. They’re using stones as hammer and anvil to get access to food. This isn’t news. The news is that only male monkeys were observed using rocks and tool use was observed in 80%of the days recorded so it’s not some rare adaptation but a habitual behavior among the monkeys on the island.