The Mostra di Paleontologia is in the ex-church of San Tommaso.  It  features a large collection of fossils and mammals' remains from about 2 million years ago that were found in the Tiber basin, near Terni. 

The most important exhibit is the a complete skeleton of a young doe (Axis nestii) that was fossilised in the position in which the animal died.  The collection also includes the remains of:

1. ✴a mammoth or elephant (Mammuthus meridionalis);
   

2. ✴a rhinoceros (Stephanorhinus etruscus);
   

3. ✴a pig (Sus strozzii);
   

4. ✴a species of hyena (Pachycrocuta brevirostris);
   

5. ✴a horse (Equus stenonis);
   

6. ✴a sabre-toothed tiger (Megantereon cultridens);
   

7. ✴a species of antelope (Leptobos etruscus); and
   

8. ✴ a turtle (Emys orbicularis).