On an island off Costa Rica there exists a hush-hush colony of giant animals which attracts the attention of two expeditions. The first one, including children, is led by a paleontologist, the other is made up of evil scientists who want to do experiments. The animals rout both without much concern for their motives.

"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?" --

In a rip-roaring journey of peril and adventure, four explorers find a lost prehistoric world in the remote wilds of South America. Huge pterodactyls rule the skies and the jungle beneath is home to lumbering stegosaurus, carnivorous dinosaurs and terrifying ape-men. If the adventurers can survive then fame and fortune almost certainly await them back in London, but in this dangerous land that defies all science and reason who knows what could happen....

Sprouting a tail and spikes over the summer before fifth grade, Sawyer, a boy with the dinosaur gene, is bullied in school, but when his tormentors begin to disappear, it is up to Sawyer, his best friend Elliot, and a mysterious new girl to rescue them from a galactically horrible fate.

A young boy who wishes for the return of dinosaurs imagines how useful they would be.

Illustrations and rhyming text reveal the Mighty Underpants War as the true reason dinosaurs are extinct.

Plant-eating dinosaurs compete against meat-eating dinosaurs at a swimming meet.

Nate the Great, the junior sleuth, and his faithful dog, Sludge, track down a friend's missing stamp, the one with the picture of a dinosaur.

Plant-eating dinosaurs face meat-eating dinosaurs in a soccer match.

The dinosaurs enjoy a variety of Christmas activities, including decorating the town, holding a parade, and receiving gifts from Santa Claws.