There are a wide range of different dinosaurs that roam the Dragonball world. This immediately would suggest that the story takes place in prehistoric times, so it is unusually to see that some parts of the Earth are very technologically advanced, with hover cars, capsules etc.
Goku's home in the mountains is located around several dinosaur habitats. During his training in the Saiyan Saga, Gohan actually befriended a herbivore dinosaurs that was later killed by a tyrannosaurus rex. Also, Bulma's father Dr. Brief enjoys keeping a variety of dinosaurs and other creatures as pets.
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