It does seem like contact with humans wouldn't leave much in the way of remains (plus wouldn't humans go after less reckless prey?), but definitely tar pits and

It does seem like contact with humans wouldn't leave much in the way of remains (plus wouldn't humans go after less reckless prey?), but definitely tar pits and the like would be more likely to snare a risk-tolerant and solitary animal than a risk-averse one in a group.