Danna Staaf

Long before humanity was even a twinkle in the eye of the first mammal, our planet was rule by strange and fearsome creatures. Some grew to monstruous size, the largest animals the earth had ever seen. During their 400 millions years of glory they diversified to fill every niche, from voracious predators to placid grazer - and then a global cataclysm almost completely wiped them out. Only a humble few of their descendants survive to keep us company today.
Of course, I'm talking about cephalopods.