Chimps have been observed using stone and wooden cleavers to chop up food in the Nimba Mountains of Guinea, Africa. The chimps were seen breaking into Treculia fruits, which are hard shelled and volleyball-sized, and then cutting them into smaller portions.
Chimps have been observed using tools in the past to find food, including stones to crush nuts and twigs to fish termites out of holes. This is the first time that chimps have been seen using tools to process food after obtaining it.
Read more at the BBC.