The Pteranodon kids and Dad get the idea to travel around on the Dinosaur Train and meet some of the biggest dinosaurs. They even sing a song, `The Biggest Dinosaurs', before meeting Allie Alamosaurus, an enormous, long-necked, plant eating sauropod who is very friendly. Allie explains that her huge, strong legs hardly bend at all, but she can still have fun playing games with the kids, and teaching them some of her favorites! Dad takes the Pteranodon kids on an overnight camping trip where they watch both a sunrise and sunset, learning that the sun rises in the east and sets in the west. The kids also find out more about nocturnal (night-active) animals, and diurnal (day-active) animals.