"Vivid descriptions of the animals, the cave, and the scientists are complemented by the original art and photos that work together unusually well." — Booklist

What was life like millions of years ago? The answer lies deep underground, in a place once home to a ferocious predator much larger than most animals walking around today. Through photographs and detailed illustrations, readers will learn how the secrets buried in a midwestern hillside helped scientists understand early life on Earth. This book's simple but informative format allows readers to follow along as paleontologist Matt Forir and his team of experts unravel a prehistoric mystery.

"[An] account of the discovery and early exploration of Missouri's Riverbluff Cave, the oldest found so far in this country with fossil remains . . . may excite curiosity about the Riverbluff finds." — Kirkus Reviews