Dinosaurs are prehistoric reptilian creatures that have appeared in many Mario games. The variety of dinosaur species is very diverse. Dinosaurs live in all types of biomes which they are well suited for. Some dinosaurs may be very delicate and solemn. On the other hand, some dinosaurs are very vicious and intelligent, such as Reznor who also happens to have the deadly ability to spew fire balls. Many types of dinosaurs live on the Mushroom Planet.
Dinosaurs also used to live in the real world for 165 million years, but went extinct 65 million years ago and are now only represented by their descendants, the birds. They died out because of the devastating effects of an asteroid that struck the Earth. Today, dinosaurs and other extinct animals are known from fossils.
In the Super Mario Bros. live-action film, an alternate, unnamed version of Earth is revealed to exist. This parallel Earth was brought into creation when the meteorite struck the true Earth 65 million years ago, causing spatial and dimensional disturbances, resulting in the creation of the alternate Earth. Some dinosaurs were then flung into this parallel world, while their kin went extinct on Earth.
On this Earth, various types of dinosaurs evolved into humanoid creatures, though some, such as Yoshi, seemed to have retained their reptilian forms. Aside from one rundown city, Dinohattan, this Earth is a desert wasteland, lacking various resources.