Fossil jaws hidden inside Cretaceous rocks have revealed that 100 million years ago, some octopuses grew into giant predators — possibly longer than a bus and more fearsome than any octopus alive today. - Space Daily

Octopuses are among the worst animals to leave behind as fossils. Their bodies are mostly soft tissue. They have no backbone, no shell like an ammonite, and no heavy skeleton that can survive for tens of millions of years. That is why a few fossil jaws can ch…