Cretaceous Period Paleobiology Dinosaur Fossils Triassic Period Fossilization Jurassic Period Cyanobacteria Fossils Late Cretaceous Excavation Fossil Analysis Paleoecology Trace Fossils Footprint Analysis Ancient Organisms Fossil Preservation Opal Fossils Marine Fossils Cretaceous Fossils Extinct Species Migrations Gut Contents Fossil Discovery Fossil Identification Oligocene Epoch Petrified Forest National Park Fossil Sites Discovery Opalization Fossil Record Isotope Analysis Pterosaur Fossils Carboniferous Period Rock Identification Footprints Dental Analysis Microfossils Sedimentary Rock Oldest Fossils Thylakoid Membranes
Researchers interpret the elongated dorsal spines as a display structure rather than a heat regulator.