Okay, my turn, I want to be an archeologist!
The animal that made that fossil lived while man was learning to use the atlatl. It was tones of brown and tan to blend into the brush. The female of the species clubbed the male into submission, mated with him and then ate him. It also ate children and small animals and terrified the native population. It is believed that it may have been the source of the tradition of medusa, because it made viewers ill. Only one modern day specimen has been identified, so it is essentially extinct.