"Where did the tree house come from? Before Jack and Annie can find out, the mysterious tree house whisks them to the prehistoric past. Now they have to figure out how to get home. Can they do it before dark ... or will they become a dinosaur's dinner?" -- Amazon.com

When Nate Twitchell discovers that one of his family's hens has laid the biggest egg he has ever seen, he is determined to see it hatch. And when it does, neither he nor his parents, the townspeople, the scientists, or the politicians from Washington are prepared for what comes out!

Summary: In 1862, after being shipwrecked in uncharted seas, Professor Arthur Denison and his twelve-year-old son Will find themselves washed up on a strange island where people and dinosaurs live together peacefully.

With the realm at peace and few dragons about, the Knights of the Round Table are bored, so Merlin sends them to face the most terrible lizards of all--dinosaurs.

The local police prove unhelpful when a 500-pound dinosaur skull vanishes from a secret excavation on Sage's family's ranch, so Teddy and his friends conduct their own investigation.

General Jackrabbit and his Robo-Rabbits from Jupiter attempt to take over the world on Ricky Ricotta's birthday.

Young dinosaurs Nosy, a pterodactyl, and Banty, an apatosaurus, become friends, despite their parents' prejudices.

Thanks to Dr. Bunsen's latest wacky invention, second-graders Gabriel, Laura, and Caesar, aka the DATA Set, are blasted back to the prehistoric era, where they quickly find themselves dashing from flying pterosaurs, stomping stegosaurus stampedes, and a sharp-toothed T-rex.

"In The Secret Explorers and the [Jurassic Rescue], dinosaur expert Tamiko and geology expert Cheng travel back to the age of the dinosaurs in an effort to rescue a dinosaur egg from destruction. However, to save the egg, the Secret Explorers first have to use all their courage and skills to outsmart a fierce Allosaurus, rescue a baby Stegosaurus, and find a way to attract an Archaeopteryx. Tamiko and Cheng soon find that, to succeed, they need to...

Yeti Blizz Richards and his gang of cryptids set out to find a friend for Vanessa, the Loch Ness Monster, even though it means traveling back in time to the dangerous age of the Cretaceous looking for plesiosaurs--unfortunately Vanessa proves to be rather timid about meeting other dinosaurs.