A dead Edmontosaurus, skin drying tight over its bones in the sun. Most carcasses rot to nothing, but a few here dry out, get buried fast, and keep their skin as fossil — the famous 'mummies'. One found in North Dakota in 1999 by a teenager, Tyler Lyson, still wears scaly skin over much of its body, and a 2022 study found scavengers' bite marks in that skin and signs the body had dried before burial. Beetles and grubs for you: 10 coins.