As Mammoth Academy spends a term excitedly preparing for its Founder's Fiesta, wild and dangerous animals called humans are spraying the school's gates with graffiti and threatening the students.

The magic tree house transports Jack and Annie on a mission to the Ice Age where they encounter Cro-Magnons, cave bears, sabertooth tigers, and woolly mammoths.

Paleontologist Richard Lavine visits an island in Central America in hope of finding a "Lost World" of dinosaurs and other prehistoric animals.

Text and illustrations explore the world of prehistoric animals and plants.

"Determined to show Ronnie just how interesting prehistoric life was BEFORE the age of the dinosaurs, Miss Lernin takes her back in time to the six parts of the Paleozoic era to study the earliest lifeforms on Earth, starting with the rise of the vertebrates"--

Geronimo Stilton's ancestor, Geronimo Stiltonoot, searches for Tiger Khan's missing flag to prevent chaos during the annual cavemouse sports competition.

"Geronimo Stilton's ancient ancestor Geronimo Stiltonoot is back in another prehistoric adventure! It's the night of the big Cavemouse Idol competition, but Geronimo Stiltonoot isn't there. He has a cold, and goes to bed early. So when it's discovered that the contest's valuable grand prize has been stolen, Geronimo is the main suspect! He must prove his innocence . . . or he'll end up in enormouse trouble!" --