• ✓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 danglingHands dangle with claws pointing down
• ✓Three weight-bearing toes on each foot
• ✓Large, heavily built predator about 6 m long, long low skull, strong three-fingered arms, small scales
• ✓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 Megalosaurus, a carnivore Megalosauridae dinosaur from the Bathonian age of the Middle Jurassic (about 166 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. A large, heavily built predator about 6 meters long with a long, low skull and strong arms with three clawed fingers, skin of small scales. Reference: Megalosaurus is an extinct genus of large carnivorous theropod dinosaurs that lived during the Middle Jurassic in what is now southern England. Although fossils from other areas have been assigned to the genus, the only certain remains of Megalosaurus come from Oxfordshire and date to the late Middle Jurassic. Anatomy: hands held with palms facing each other (not pronated, not palms-down, not dangling); three main weight-bearing toes on each foot. Full body in side view, whole animal visible, standing in a warm Middle Jurassic coastal plain in southern England, like the Taynton Limestone of Oxfordshire, with conifers, cycads and ferns near a shallow sea, 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