The funnel on the ventral surface of their head is not only an outlet for reproduction, excretion, and ink, but also an important organ of locomotion for the squid. When the squid body tightening, the pocket-shaped body water can be from the funnel mouth out of the rapid spray, the squid with the help of the reaction force of the water to move forward quickly, like a strong crossbow off the string. Because the funnel is usually always pointing forward, so the squid movement is generally backward. The special structure of the squid's body gives it the ability to swim fast. In order to adapt to this way of swimming, in the long-term evolutionary process, the squid shell gradually degraded and completely buried in the skin inside, the function also from the original protection to support.

In marine life, squid swimming speed is the fastest, it is the reason why the swimming speed is very fast, because with the general fish swimming by fins is different, it is by the belly of the funnel tube spraying the reaction force of the water to fly forward, and its ability to spray like a rocket launch, which can make the squid from the depths of the sea to leap up, jumping out of the water as high as 7 meters to 10 meters. The body of the squid is like a cannonball, able to fly about 50 meters in the air. The speed of the squid swimming in the sea water can usually reach more than 15 meters per second, and the maximum speed can reach 150 kilometers per hour. The sailfish, which is known as the champion of swimming speed among fish, has a speed of only 110 kilometers per hour, so it has to be inferior.