(a species of owlet moth (Noctuid)) Some caterpillars, after they emerge from their egg, can increase their weight by 25,000 times.

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The Ballad of Big Al - a walking with dinosaur special

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The creators of the Walking with Dinosaurs series that took the world by storm have returned to tell the story of Big Al.

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The Ballad of Big Al - a walking with dinosaur special-dvd

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A few years ago, an amazing fossil was unearthed in Wyoming USA. Not only were the bones they found those of a dinosaur that lived 145 million year ago, the skeleton of this creature was nearly complete.

Now the scientists’ find has been resurrected even more vividly as the BBC uses the same computer graphics and animatronic techniques as the original Walking with Dinosaur series, to recreate Big Al’s life for the television screen.