• ✓Bipedal, back horizontal, tail held straight out off the ground
• ✓Mouth closed, lips covering the teeth so none are visible
• ✓Palms facing each other, not turned down or dangling
• ✓Three weight-bearing toes on each foot
• ✕Long strong arms with huge curved claws on the thumb and first fingerArms not long and the thumb claw not as enormous as specified
• ✓Slender predator about 8 m long, long narrow head, long legs
• ✓Whole animal visible in side view
• ✓Scene matches the period and the fossil site
• ✓No text, people or modern objects

Checked by Claude (AI) on Nov 3, 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 Megaraptor, a carnivore Megaraptoridae dinosaur from Turonian–Coniacian times (93.9–85.7 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. Long, strong arms with an enormous curved claw on the thumb and a large claw on the first finger. Reference: Megaraptor is a genus of large theropod dinosaur, the type genus and namesake of the clade Megaraptora and family Megaraptoridae. Its fossils have been discovered in the Patagonian Portezuelo Formation of Argentina, South America, dating to the Turonian and Coniacian ages of the Late Cretaceous, roughly 90–88 million years ago. One species of Megaraptor, M. namunhuaiquii, has thus been named, known from seven partial or fragmentary skeletons, with only two including skull elements. Anatomy: three main weight-bearing toes on each foot; a slender, lightly built predator about 8 meters long with a long, narrow skull and long legs. Full body in side view, whole animal visible, standing in a Late Cretaceous landscape with conifers, ferns and early flowering plants, no grass lawns. 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