The Megalania was a huge meat eating lizard that ruled its territory for a million years. What destroyed this killing machine - and could scientists reconstruct it? S1/Ep5
The Acrocanthosaurus was the greatest predator ever to stalk North America - a 12m beast able to kill 30 ton prey. Can scientists reconstruct this killing machine? S1/Ep4
This monster bird stood seven-feet tall and battled wolves and sabretooth tigers. Scientists reconstruct its deadly hooked beak to see how it killed its prey. S1/Ep1