• ✓Thick high bony dome ringed with knobs and short spikes
• ✓Bipedal, short neck, small beak, short arms, stiff straight tail
• ✓Whole animal visible in side view
• ✓Scene matches the period and the fossil site
• ✓No text, people or modern objects

Checked by Claude Opus 5.5 (checked item by item from the image) on Oct 28, 2026. The score is the share of checklist items the image gets right; it is not an expert scientific review.

Prompt used to create the image

Scientifically accurate paleoart of Pachycephalosaurus, a herbivore Pachycephalosauridae dinosaur from the late Maastrichtian, at the very end of the Cretaceous (about 68–66 million years ago). A thick, high, rounded bony dome on top of the skull, ringed at the back with bony knobs and short spikes. Reference: Pachycephalosaurus is a genus of pachycephalosaurid ornithischian dinosaur. The type species, P. wyomingensis, is the only known definitive species. It was among the last species of non-avian dinosaurs on Earth before the Cretaceous–Paleogene extinction event, which lived during the Maastrichtian age of the Late Cretaceous period in what is now western North America. Anatomy: bipedal with a short neck, small beak, short arms and a stiff tail held straight out. Full body in side view, whole animal visible, standing in a humid latest-Cretaceous floodplain forest like the Hell Creek Formation of North America, with conifers, ferns and early flowering trees and shrubs, no grass. Natural history museum illustration style, realistic textures and natural daylight, muted natural colors. No text, no labels, no humans, no modern objects.

Facts in the prompt come from Wikipedia (en) and Paleobiology Database