Lesser-Known Wonders: 30 Fascinating Dinosaurs You’ve Probably Never Heard Of

Amargasaurus

This Argentine sauropod stood out from its bigger cousins with twin rows of tall spines running down its neck and back. Named in 1991, Amargasaurus might have used these spines to regulate body temperature or display to potential mates. Scientists debate whether the spines supported skin sails or stuck out like porcupine quills. Either way, this Early Cretaceous dinosaur would have cut a striking figure.