Reanimated baboon skeleton

You're fighting a reanimated baboon skeleton

   You place the baboon skull on the ground and set about the business of reconstructing a museum-grade baboon skeleton, imagining the kinds of awesome jobs you'll be able to get with that line item on your resume.

   You grab a fossilized torso, prop it under the skull, and arrange four limbs around it. You step back to admire your handiwork, but before you can properly take it all in, the bones fuse together and the baboon sits up, breaking free of its rocky bindings with a thunderous crack.

   Since there isn't a fossilized Jane Goodall nearby, you're completely unable to communicate with the thing, so you can't understand the dusty "eek ook eek" noise it makes as it advances on you. Once it throws a punch at you, you understand perfectly.

http://images.kingdomofloathing.com/adventureimages/foss_baboon.gif

It absentmindedly scratches itself with one hand as it punches you in the lower back with the other.