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Keira Chirostenotes cares for the kids while the folks go out to dinner; and the kids learn about sycamore trees while spending a day with their grandparents.
Tiny meets a Jurassic mammal that looks like a cross between a beaver, otter and platypus; and Don befriends a butterfly that he names Dan.
The kids ride the train through the Cretaceous, Jurassic and Triassic periods; Buddy and Tiny help calm a jittery King Cryolophosaurus, a legendary dino-rocker, before his first show in years.
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