Dinosaur egg fossils | Walking with Dinosaurs: Ballad of Big Al | BBC

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Scientists step back 145 million years to tell the story of 'Big Al', a complete skeleton of an adolescent Allorsaurus found in Wyoming in 1991. The story starts in the Atlantic coast of Portugal where the discovery of remarkable fossils of dinousaur egg shells shed light on how Big Al was born.

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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