• ✓Bulky iguanodontian plant-eater on four legs, tail off the ground
• ✓Long head with a beak at the tip
• ✓Conical thumb spikes
• ✓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 Siamodon, a herbivore Iguanodontia dinosaur from Aptian times (121.4–113.2 million years ago). A medium-sized, bulky iguanodontian plant-eater that walks on four legs, with a long tail held off the ground. Reference: Siamodon is an extinct genus of iguanodontian ornithopod dinosaur from Early Cretaceous deposits of northeastern Thailand. Anatomy: a long head with a toothless beak at the front; a conical spike on each thumb. Full body in side view, whole animal visible, standing in an Early Cretaceous floodplain like the Khok Kruat Formation of northeastern Thailand, warm and semi-arid with conifers, cycads, ferns and rare early flowering plants, 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