Schematic map displaying the scale pattern of Anatosaurus / Edmontosaurus annectens. Bigger dots represent bigger scales, though in the real animal they wouldn't be the same exact relative size as they are here. This is just an amateur study after all.
We can know the kind of skin covering and scale, scute and osteoderms pattern of certain fossil animals thanks to petrified skin impressions found alongside their bones or in their footprints. In the case of Anatosaurus and other hadrosaurs, we are lucky to have found several specimens with fossilized soft tissue or skin prints.
Based on the skeleton by MrSamosaurus on Deviantart. Inspired by the Anatosaurus of the videogame Saurian. Made with black ink and quill.