• ✓Bipedal, back horizontal, tail held straight out off the ground
• ✓Mouth closed, lips covering the teeth so none are visible
• ✓Predator about 6 m long, long narrow low skull, long legs and tail, small scales
• ✓Arms under half the leg length, three large curved claws on each handมือมีกรงเล็บโค้งใหญ่ แต่ห้อยลงพื้น
• ✓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 31, 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 Herrerasaurus, a Herrerasauridae dinosaur from the Carnian age of the Late Triassic (about 231 million years ago). Bipedal with the back held roughly horizontal and the tail held straight out behind for balance, never dragging on the ground. NOT standing upright like a kangaroo. Mouth closed with all teeth fully hidden behind scaly lips, like a monitor lizard. NO visible teeth. Reference: Herrerasaurus is likely a genus of saurischian dinosaur from the Late Triassic period. Measuring 6 m (20 ft) long and weighing around 350 kg (770 lb), this genus was one of the earliest dinosaurs from the fossil record. Its name means "Herrera's lizard", after the rancher who discovered the first specimen in 1958 in South America. Anatomy: a predator about 6 meters long with a long, narrow, low skull, long hind legs and a long tail, skin of small scales; arms less than half as long as the legs, with three large curved claws on each hand. Full body in side view, whole animal visible, standing in a humid Late Triassic river floodplain like the Ischigualasto Formation of Argentina, with conifers, seed ferns, horsetails and ferns, no grass and no flowering plants. 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