How a complete skeleton reveals the prehistoric origins of Big Al

Dinosaur Egg Fossils | Walking with Dinosaurs: Ballad of Big Al | BBC Earth · 3:44 · Video: BBC Earth · Watch at the source

In short: This clip from the BBC's Walking with Dinosaurs explores the life of Big Al, an adolescent Allosaurus. By examining remarkable egg shell fossils found in Portugal, scientists reconstruct the world as it was 145 million years ago.

The video follows the story of Big Al, a complete adolescent Allosaurus skeleton discovered in Wyoming in 1991. To understand the creature's beginnings, researchers look to the Atlantic coast of Portugal, where remarkable dinosaur egg shell fossils provide insight into how such animals were born.

Originally broadcast in 1999, the Walking with Dinosaurs series aimed for unprecedented accuracy. The production combined cutting-edge computer graphics and animatronics with scientific fact and informed speculation over a two-year development period.

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