AdvertisementMyth Busting: The Truth About Animals And ToolsDecember 23, 2011Jon HamiltonfacebookEmailA tufted capuchin uses a stone hammer to crack open a nut in Brazil's Parnaiba Headwaters National Park. (Getty Images)
A tufted capuchin uses a stone hammer to crack open a nut in Brazil's Parnaiba Headwaters National Park. (Getty Images)