• ✓Bipedal, back horizontal, tail held straight out off the groundหลังขนานพื้น คอชูขึ้นเล็กน้อย
• ✓Mouth closed, lips covering the teeth so none are visible
• ✓Palms facing each other, not turned down or danglingมือพับอยู่ใต้ขนปีก กรงเล็บงอเข้า
• ✓Slender long-legged predator about 2.5 m long, narrow head, large forward-facing eyes
• ✓Fully feathered, wing-like arm feathers, long feathered tail
• ✓Enlarged curved claw on the second toe, held off the ground
• ✓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 Troodon, a omnivore Troodontidae dinosaur from Campanian–Maastrichtian times (83.6–66 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. 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 slender, long-legged, lightly built predator about 2.5 meters long with a narrow head and large forward-facing eyes. Reference: Troodon is a controversial genus of relatively small, bird-like theropod dinosaurs definitively known from the Campanian age of the Late Cretaceous period. It includes at least one species, Troodon formosus, known from Montana. Discovered in October 1855, T. formosus was among the first dinosaurs found in North America, although it was thought to be a lizard until 1877. Anatomy: fully feathered, with wing-like feathers on the arms and a long feathered tail; an enlarged, curved claw on the second toe, held off the ground. Full body in side view, whole animal visible, standing in a Late Cretaceous coastal floodplain like the Dinosaur Park Formation of Alberta, with conifers, ferns and early flowering plants by a river, 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