頭足類 (tōsokurui), or cephalopods, are a class of mollusks that include creatures like octopuses, squids, and cuttlefish. They are known for their distinct head, large eyes, and tentacles, which are equipped with suckers. Cephalopods are highly intelligent and exhibit complex behaviors, such as problem-solving and communication. These animals are primarily found in marine environments and are characterized by their ability to change color and texture for camouflage. They possess a unique body structure, including a mantle that houses their organs and a siphon for propulsion. Cephalopods play a vital role in ocean ecosystems as both predators and prey.