Tentacled mollusks are a group of animals that includes octopi, which have eight tentacles. Octopi are the most well-known members of this group, but there are also squid and cuttlefish, which have ten tentacles. All of these animals are invertebrates, meaning they do not have a backbone, and they live in oceans around the world. They are known for their intelligence and ability to camouflage themselves in their environment.