The plates on a Stegosaurus’s back were not solid bone but were filled with blood vessels that could help regulate its body temperature!
Dinosaurs And Mythical Creatures - Facts for Kids

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Random Facts About Dinosaurs And Mythical Creatures For Kids
Scientists have found over 50 complete or partial Triceratops skulls, making it one of the best-understood dinosaurs!
Scientists estimate that Stegosaurus could only move at speeds of about 5 miles per hour (8 km/h), about as fast as you can ride a bike!
Basic Information
Velociraptor belonged to a family of dinosaurs called “dromaeosaurids,” which means “running lizards” — they were some of the smartest dinosaurs that ever lived!
Pterodactylus had special muscles in its wings that helped it make fine adjustments during flight!