Rock-wielding monkeys make adjustments when cracking nuts

STRIKE FORCE Wild bearded capuchin monkeys, such as this adult male, adeptly crack open nuts by adjusting the force of each blow made with a pounding stone, a new study finds.
D. Fragazy
STRIKE FORCE Wild bearded capuchin monkeys, such as this adult male, adeptly crack open nuts by adjusting the force of each blow made with a pounding stone, a new study finds.
D. Fragazy