This Australian ornithopod stood up to 5 m, reaching a length of 10 m. Since only 60% of it's skeleton were found, early reconstructions of it were modeled after Iguanodon, with a thumb spike. Scientists now believe this dinosaur was not closely related to iguanodontids, but that it belonged to a family of its own. Its most distinctive feature was a well-developed bump on the snout, which it is thought may have housed an acoustic organ for calling to other dinosaurs.
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