Class: Cephalopods - Octopi, Squids, Cuttlefish, and the Chambered Nautilus

Cephalopods are fast-swiming mollusks. They have well developed brains, a circulatory system with three hearts, veins, and arteries, usually have ink sacs and in most cases no external shell. They live only in the sea, use jet propulsion, and in most cases can rapidly change skin color and texture.

Cephalopods are the squids, octopuses, cuttlefish and nautiloids; the most advanced mollusks, and quite possibly the most intelligent invertebrates. They possess eyes with a focusing lens, an efficient closed circulatory system, relatively large brains, and are capable of demonstrable learning.

Amazing facts about cephalopods - Squids and Octopi

• Pictures of cephalopods
• Cephalopods
• The Fact Monster - Cephalopods
• Types of cephalopods

• Octopus Giant Pacific Octopus as found in Katchemak Bay Octopus Quiz The Fact Monster - Octopi Videos: Shark vs Octopus Think you know the outcome when its shark versus octopus? Giant Pacific Octopus The Giant Pacific Octopus is smarter than you might think. Smart Octopus How smart and flexible is the octopus? Can it figure out how to open a jar?

  Squid Giant Squid Video of Squids Cephalopods in Action - Video clips of some remarkable deep-sea squid. The Fact Monster - Squids Video: the Giant Humbolt Squid

  Cuttlefish The Fact Monster - Cuttlefish Video - cuttlefish at the Seattle Aquarium Vidoe - Cuttlefish camouflage, the animal shifts its colours from mimicking the brown coral to the bright background and 'ghosts out', before casually departing. Video - cuttlefish changing colors

  Chambered Nautilus The Fact Monster - Nautiluses How does the chambered nautilus keep upright and afloat? Chambered Nautilus video - Chambered nautilus

Octopus and Squid of Katchemak Bay
Giant pacific octopus - Octopus dofleini	Giant pacific octopus - Octopus dofleini	Opalescent squid eggs - Loligo opalescens	Stubby squid - Rossia pacifica	Stubby squid - Rossia pacifica