Dusk, the world's first bat, must lead his colony to safety in a time of changing species.

When their cousin is stung by a cavefly and falls into a deep sleep, Geronimo and Thea set out in search of the rare pink stinkrose, whose petals are thought to provide a cure.

Determined to become Internet stars, two prehistoric creatures--Trilobite and Amber, a walking whale--face off against a host of creatures vying for fame and fortune, using their newfound skills to take the online world by storm.

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.

A guinea pig tells her child the true story of giant guinea pigs that lived in Venezuela about eight million years ago.

Geronimo Stilton's ancestor, Geronimo Stiltonoot, investigates a witness's claim of a moving mountain of ice.

"Trilobite scores a viral video hit when he stages a comedy opera prank. Amber gets pulled into the wild world of walrus fighting, and Tiffany's past as a competitive video game player comes back to haunt her. Opabinia and company are also back to cause trouble at every step. The gang will cause mayhem on a hospital ship and a giant floating mall shaped like a ball before they find out that fame always comes at a price"--Provided by publisher.

It's the start of an exciting cavemice contest: a race to Boulder Bay and back! It's a dangerous route, but it will supply the village cheese maker with rare hot lava peppers, and there's a big cash prize. Trap teams up with Geronimo -- who has a lazy, slow, city autosaurus (the cavemice mode of transportation). Can they reach the finish line without going extinct on the way?

"Stink wants to make the find of the century. He's on a dig, dig, digging quest in his backyard to find a tooth from a saber-toothed cat, otherwise known as a Smilodon. Why not? Two kids in Michigan found a mastodon bone in a backyard stream, and a girl in Great Britain found a pterosaur bone. It could happen! But Judy thinks the chances of finding a saber-toothed anything in the Moody backyard are one in a gazillion million. Will Stink make a discovery...