Godzilla’s Design Was Based On These Real-Life Dinosaurs
By DEVIN MEENAN
"Godzilla on My Mind: Fifty Years of the King of Monsters" by William Tsutsui, states that the design for Godzilla was based on three real dinosaur species.
The Iguanodon could walk bipedally on its hind legs. It wasn't their preferred way of moving, but they could walk like Godzilla would millions of years later.