What fossil proves that dodo birds existed?

The primary fossil evidence for the existence of dodo birds (Raphus cucullatus) includes skeletal remains found on the island of Mauritius, where the dodo was native. These fossils, particularly the dodo's unique bones such as the humerus and femur, have been discovered in various locations, including a famous find at the Mare aux Songes swamp. Additionally, historical accounts and illustrations from the 17th century, along with egg fossils, further confirm the dodo's existence before its extinction in the late 17th century.