When I think of dinosaurs, I think about bones. The skeletons that sunk their ancient talons into my imagination and never let go. There’s something about them that immediately makes my mind start to wrap the osteological frames with muscle, skin, and protofeathers, animating what’s been dead for over 66 million years.

But this is too narrow a view. Our knowledge of dinosaurs – as well as other forms of prehistoric life – is not constrained to bones alone. Some of the most powerful evidence about how ancient creatures actually moved and behaved comes from trace fossils – tracks, tail drags, and other impressions. This is fossilized behavior. Skeletons arrayed in museum halls may invoke more awe, but, if you really