"Is there is any way of knowing what noises, if any, dinosaurs would have made?" asks Freddie Quinn, aged 8 from Cambridge in New Zealand.

From Jurassic Park to Walking with Dinosaurs, the roars of gigantic dinosaurs like T.Rex are designed to evoke fear and terror.

But did dinosaurs actually roar? And how do paleontologists investigate what noises these extinct animals may have produced? Hannah and Adam talk to dinosaur experts Steve Brusatte and Julia Clarke to find out.

Plus Jurassic World sound designer Al Nelson reveals the strange sounds they used as dinosaur noises in their Hollywood blockbusters.

Presenters: Hannah Fry, Adam Rutherford

First broadcast on BBC Radio 4 in 2019.