What type of locomotion do many species of cephalopods use?

Many species of cephalopods, such as squids and octopuses, utilize jet propulsion as their primary means of locomotion. This mode of movement involves the rapid expulsion of water from their bodies through a siphon, allowing them to propel themselves forward quickly and efficiently. This method of locomotion is particularly advantageous for evasion from predators and allows for agile movement in the water.

In addition to jet propulsion, cephalopods can also employ crawling using their arms, which provides a different method of movement, especially when they are on the ocean floor. However, the distinct and rapid nature of jet propulsion makes it the most notable and defining locomotor mechanism for these creatures.