A squid moves using a system of jet propulsion, pulling water into its mantle cavity, contracting the muscles of the mantle wall and expelling the water through its siphon or funnel. Its fins aid maneuverability and also help with lift and motion while the squid travels at slow speeds.Know More
A squid has one funnel system for intake and another for outflow. The mantle expands as the squid draws water into it. When it is full, the intake closes. The strong mantle muscles contract, the outflow funnel opens, and the pressure of the fluid in the mantle creates kinetic energy that propels the squid in a rapid burst of speed. Squid are able to reach 25 mph, making them the speediest marine invertebrates. When a squid is swimming steadily, it draws in and expels water in a pulsing pattern, drawing in more water per burst when it wants to increase speed.
By controlling the direction of the outflow funnel, a squid is able to control its swimming direction. It can go backward, forward, spin or hover. When fleeing predation, a squid faces its funnel forward and jets backward. When attacking prey, it faces its funnel backward so it can approach front-on. Researchers have studied squid locomotion when designing mechanical jet propulsion systems such as turbojets.Learn more about Squid
Legends of monster squids or kraken are probably based on sightings of the giant squid, a deep-sea animal known to live in the waters off Norway and Greenland where the kraken legend arose. Giant squids can reach up to 50 feet in length if their tentacles are included.Full Answer >
According to National Geographic, the largest squid ever found measured 59 feet long and weighed about a ton. The squid was a "giant" squid, the largest of the more than 280 squid species found worldwide.Full Answer >
The squid's natural predators include birds, fish, sharks and whales. Squid predators vary depending on their habitat. Squid that live near the surface of the water or in warm waters have an increased risk of being eaten, whereas squid that live in icy waters have fewer predators and mainly only have to be wary of sharks and whales. Most capable sea creatures feed on squid.Full Answer >
The term "devil squid" is usually used in reference to the Humboldt squid, which has a reputation of being highly aggressive. They have attacked divers and been observed engaging in cannibalism.Full Answer >