Stock Photo - Protoceratops dinosaur (right) defending its  nest against  a raptor  dinosaur,  computer artwork.  A clutch of eggs is at lower  right ... .   Protoceratops was  a small  dinosaur  that inhabited what is now central Asia between 85 and 80 million years  ago. Several  small  raptors also lived in this area at this time,  notably Oviraptor, which is thought to have  fed  mainly  on the eggs of other dinosaurs. Protoceratops  was  a  herbivorous  dinosaur  that reached a maximum length of around two metres.