Spinosaurus

"If we base the ferocious factor on the length of the animal, there was nothing that ever lived on this planet that could match this creature."

"It is a really bizarre dinosaur - there's no real blueprint for it. It has a long neck, a long trunk, a long tail, a 7ft (2.1m) sail on its back and a snout like a crocodile. And when we look at the body proportions, the animal was clearly not as agile on land as other dinosaurs were, so I think it spent a substantial amount of time in the water."

"It was a chimera: half duck, half crocodile. We don’t have anything alive that looks like this today."