• ✓Bipedal, body tilted slightly upward, tail off the ground
• ✕Palms facing each other, not turned down or danglingLong claws hang pointing down
• ✓Extremely long straight hand claws, each nearly as long as a human arm
• ✓Pot belly, long neck, small beaked head, shaggy feathers
• ✕Broad feet with four weight-bearing toesFour weight-bearing toes not visible
• ✓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 Therizinosaurus, a herbivore Therizinosauridae dinosaur from the Maastrichtian of the Late Cretaceous (about 69–66 million years ago). Bipedal with the body tilted slightly upward at the front and the tail held off the ground. Extremely long, straight, blade-like claws on the hands, each almost as long as a human arm. Reference: Therizinosaurus is a genus of very large therizinosaurid dinosaurs that lived in the Maastrichtian age during the Late Cretaceous period in what is now Asia roughly 69-66 million years ago. It contains a single species, Therizinosaurus cheloniformis, known from the fossiliferous Nemegt Formation. The first remains of Therizinosaurus were found in 1948 by a Mongolian field expedition in the Gobi Desert and later described by Evgeny Maleev in 1954. The genus is only known from a few bones, including gigantic manual unguals, from which it gets its name, and additional findings comprising fore and hindlimb elements that were discovered from the 1960s through the 1980s. Anatomy: hands held with palms facing each other (not pronated, not palms-down, not dangling); a pot-bellied body, long neck, small head with a toothless beak at the front, covered in simple shaggy feathers; broad feet with four weight-bearing toes. Full body in side view, whole animal visible, standing in a humid Late Cretaceous river floodplain forest like the Nemegt Formation of Mongolia, with conifers and broadleaf flowering trees, 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