The world's largest invertebrate remained hidden from humanity until a tantalising glimpse 100 years ago. But it would be ...

Giant squid have a parrot-like beak between their eight arms and two ... and have three hearts that pump blue blood. Giant and colossal squid have the largest eyes in the animal kingdom.

and he had spent a lifetime studying the stomach contents of sperm whales – and had reported many times their beaks in the stomachs of sperm whales. I was aware of the colossal squid's existence.