Octopuses Don't Have Tentacles!
Many people refer to octopus limbs as tentacles, but technically, octopuses don't have any tentacles at all! Instead, they have arms. When you're talking about cephalopods, tentacles tend to be much longer than arms and only have suckers at their "clubbed" ends, whereas arms are shorter, stronger, and suckered all the way down. Tentacles also typically come in pairs. Squid and cuttlefish have eight arms plus a pair of feeding tentacles.
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from It's Okay To Be Smart
Key Facts In This Video
Octopuses have beaks that can pierce through crab and clam shells. (1:02)
Giant Pacific octopuses have about 240 suckers on each arm. (1:25)
The plural of octopus is "octopuses," not "octopi". (2:47)