Buddy, Tiny, Shiny and Don are excited that Keira Chirostenotes gets to babysit them for the night while Mr. and Mrs. Pteranodon go out for a dinner on the Dinosaur Night Train. Keira shows the kids how a dead log's decomposition provides food and shelter for many living creatures. The Pteranodon kids are spending the day with Grandma and Grandpa Pteranodon! On the Dinosaur Train trip to their grandparents' place, Buddy, Tiny, Shiny and Don learn about sycamore trees.