From the BBC: Chimpanzees ‘hunt using spears’.

Chimpanzees in Senegal have been observed making and using wooden spears to hunt other primates, according to a study in the journal Current Biology.

Researchers documented 22 cases of chimps fashioning tools to jab at smaller primates sheltering in cavities of hollow branches or tree trunks. [continue]

Thanks to cricket for telling me about this story.