Over the years, researchers have learned a lot about dinosaur anatomy, but there's one feature that keeps eluding us.
Of all the dinosaur tracks discovered, only a rare few, far less than one percent, show any traces of skin.
It's a serious blindspot, especially when the patterns that this organ makes are like fingerprints, showing unique signatures among dinosaurs.
Finding a perfectly preserved dinosaur 'fingerprint' would be one thing. Paleontologists have now found five.