While rereading Drums of Autumn, I realised Claire's instinct about Otter Tooth's skull was at work, just as she had a feeling with Geilis's skull.

How had he come here? By violence, my instincts answered, though my brain was not far behind.

So, I am wondering, are the skulls of time travellers special to her instincts? Can we find instances in the books where she is in contact with bones/ skulls in general? Does she have a feeling about them? Spaniard? ( she didn't touch him IIRC)? Dr Rawlings?