The unseen dinosaur killer - Planet Dinosaur - BBC

Fossil evidence found in a Montana (USA) bonebed suggests that meat eating dinosaurs could die of poisoning from bacteria such as botulism, something theropod dinosaurs have evolved to avoid. Narrated by John Hurt Planet Dinosaur tells the stories of the biggest, deadliest and weirdest creatures ever to walk the Earth, using the latest fossil evidence and immersive computer graphics. Subscribe to BBC Earth: Visit for all the latest animal news and wildlife vid