Larger cephalopods have been known to eat smaller cephalopods, not the other way around.
What do Cephalopods eat?
Sharks eat cephalopods
Cephalopods use their tentacles mainly to catch food.
Nope. They are reptiles. Cephalopods are octopuses and squids and cuttlefish. Reptiles and cephalopods are not very closely related at all; cephalopods are protostomes and cephalopods are deuterostomes, and the protostome/deuterostome split occurred very early in the history of animalia.
no
No
No. Squids and octopi are a class of mollusks called Cephalopods, and as with all mollusks, cephalopods are invertebrates.
Octopus, cuttlefish and squid are all cephalopods. http://en.wikipedia.org/wiki/Cephalopod
Bivalves, univalves, and cephalopods are all types of mollusks. So are gastropods.
No, they are birds.
No, they are cephalopods.