In 2007 Jill Prueta,an anthropologist at lowa State University,reported that a Fongoli female chimp namedTumbo was sharpening a branch with her teenth and wielding it like a spear. She used it to stab at a bush--a pocket-size,tree-dwelling nocturnal primate. Until that report,the regular making of tools for hunting and killing mammals had been considered uniquely human behavior. Over a span of 17 days at the start of the 2006 rainy season,Pruetz saw the chimps hunt bush babies 13 times. There were 18 sightings in 2007. It would appear the chimps are getting creative.