• ✓Bipedal, back horizontal, tail held straight out off the groundหลังขนานพื้น คอโค้งชูขึ้น
• ✓Palms facing each other, not turned down or dangling
• ✓Three weight-bearing toes on each foot
• ✓Huge bulky body about 11 m long with a tall sail-like hump over the hips
• ✓Long, wide, toothless duck-like bill and a deep lower jaw
• ✕Enormous arms about 2.4 m long with three blunt clawsแขนใหญ่ยาว แต่กรงเล็บแหลมโค้ง ไม่ทู่
• ✓Feathered body with a feather fan at the tail tip
• ✓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 Deinocheirus, a omnivore Deinocheiridae dinosaur from the Maastrichtian age of the Late Cretaceous (about 70 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. Hands held tucked in near the chest with the palms facing inward toward each other, like clapping, claws curving inward and forward. NOT hanging down, NOT palms-down, NOT claws pointing at the ground. A huge, bulky body about 11 meters long with a tall sail-like hump along the back over the hips. A long, toothless, wide duck-like bill and a deep lower jaw. Reference: Deinocheirus is a genus of large ornithomimosaur that lived during the Late Cretaceous around 70 million years ago. In 1965, a pair of large arms, shoulder girdles, and a few other bones of a new dinosaur were first discovered in the Nemegt Formation of Mongolia. In 1970, this specimen became the holotype of the only species within the genus, Deinocheirus mirificus; the genus name is Greek for "horrible hand". No further remains were discovered for almost fifty years, and its nature remained a mystery. Anatomy: three main weight-bearing toes on each foot; enormous arms about 2.4 meters long with three blunt, curved claws on each hand; body covered in feathers, with a fan of feathers at the tip of the tail. 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