KU paleontologist David Burnham resumes final excavation of the juvenile tyrannosaur

[Grim Reaper 6]

The discovery of a juvenile tyrannosaur fossil is extremely rare. Of the approximately 100 T. rex fossils discovered so far, only a handful are juveniles. But what makes this KU specimen an even greater rarity is the exquisite preservation of its teeth, according to researchers. The KU tyrannosaur has all its teeth intact in the upper jaw, along with its respective replacement teeth. One of the more remarkable differences between young and adult tyrannosaurs are their teeth. The young tyrannosaur has less robust, more blade-like teeth than an adult, possibly reflecting differences in their feeding ecology..

https://biodiversity.ku.edu/news/article/ku-paleontologist-david-burnham-resumes-final-excavation-of-the-juvenile-tyrannosaur