From a tiny hatchling just 30 centimetres long to fully grown dinosaur requires a huge food intake. But just how did Big Al and his fellow dinosaurs feed such fantastic growth? Scientists turn to the dinosaur's two closest living relatives - the crocodile and alligator - to find out.
Fascinating clip from the BBC natural history programme Walking with Dinosaurs: The Ballad of Big Al.
Broadcast in 1999, Walking with Dinosaurs set out to create the most accurate portrayal of prehistoric animals ever seen on the screen. Combining fact and informed speculation with cutting-edge computer graphics and animatronics effects, the series took two years to make.
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