From the Guardian today:
"In the dry heat of the west African savanna, a chimp called Tumbo hauled herself up into a wizened tree. She had spotted something: an interesting-looking hole at a fork in the trunk. Watching her, researcher Paco Bertolani suspected that she was looking for insect larvae to eat; the chimpanzees had done this before. Tumbo grabbed a thin branch, snapped it free and purposefully honed one end, using her teeth to make a point. Then, she moved closer to the hole, grasped the primitive spear, and rammed it inside with as much might as she could muster. Afterwards, she pulled it out and sniffed and licked the end. Tumbo repeated the violent stabs again and again until, apparently satisfied, she moved across to a withered branch adjoining the trunk and leapt up and down to break it free. From within the now exposed hole, she retrieved an unmoving bushbaby, evidently dead as a result of the onslaught. She sat down and calmly dismembered the animal, chewing on the meat with relish and accompanying her meal with odd handfuls of fresh leaves."
Which is more unnerving - monkey with spear, or monkey eating dead animal with side salad?