Prehistoric reptile beasts who once roamed the Earth. This category is for literal dinosaurs, Kaiju heavily based on Dinosaurs, or giant reptilian Kaiju, whose species was noted to have roamed Earth during the past.
This category does not include dinosaur-like monsters that came from space. Simply having Dinosaur in their title also does not automatically qualify a Kaiju.
Prominent in Tsuburaya's series, especially Dinosaur Catchers, Dinosaur War Aizenborg and Koseidon.