Squid vs. Octopus

Ben and I were trying to decide whether we were finding squid or octopi in the tanks outside of some of the restaurants so I decided to find a good answer.  This site had some pretty good comparisons and made the distinction a little easier to tell!  Did you know that Octopi like to kiss!?!? 

Octopus	Squid
About:	Octopus is a cephalopod with eight arms. It is a head-footed animal	Squid is a cephalopod with eight arms and two tentacles arranged in pairs. It is a head-footed animal
Anatomy:	An Octopus has a mantle, a head, 8 arms endowed with 1 or 2 rows of suckers but no hooks or sucker rings	A standard Squid has 2 fins, a mantle, a head, 8 arms and 2 tentacles each endowed with hooks and/or suckers or sucker rings
Fins:	Most octopi do not have fins, though some deep water octopuses may be the exceptions.	Squid have 2 fins on their heads
Shell:	Octopi do not have any shell or stiff bone in their body	Squid possess a stiff structure known as a pen, which acts like a flexible backbone
Live in:	Octopi live in dens on the sea floor	Squid live in the open oceans
Diet:	Octopi eat bottom dwelling Crustaceans.	Squid eat fish and shrimp.
Blood:	blue	blue
Class:	Cephalopod	Cephalopoda
Phylum:	Mollusca	Mollusca
Order:	Octopoda	Teuthida
Superorder:	Octopodiformes	Decapodiformes
Kingdom:	Animalia	Animalia
Sub Class:	Coleoidea	Coleoidea
Species:	300	298
Size:	Octopuses range in size from 1cm to more than 5m	Average Squid no more than 60cm Giant one up to 13m, some reported even 20m (66ft.)
Nature:	Octopi are solitary in nature and always live alone	Squid maybe solitary or may live in schools
Catching and Eating Their Prey:	Octopi grab their prey and pierce through its shell and inject paralyzing venom into it. Dissolves and loosens meat with saliva	Squid catch food with their two long tentacles and eat it in chunks.
Lifespan:	1 to 3 years	9 months to 5 years
Geographical Distribution:	In salty water of the tropics to the temperate zones.	In salty water of the tropics to the temperate zones.
Plural:	Octopodes (Octopi)	Squid (when referring to a collective); Squids (when referring to 2 or more species of squid)