We just learned about the Cuttlebone.
Another two parts of Cephalopod's body are the Arms and Tentacles.
It used to be that all of the legs of squids and octopuses were called tentacles, but a while back things changed and now they are seen as two different things: arms and tentacles.
The octopus only has 8 arms, because they are shorter and have suckers all along them.
Squids have 6 arms and 2 tentacles, and the tentacles are the ones with no suckers all along, but teeth or hooks on the end.
(from: wikipedia - cephalopod limb)
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