Octopuses and squids can change color in seconds to hide from predators. They are really intelligent. In fact, they are the most intelligent of all invertebrates (animals without backbones). Octopus and squid are mollusks. They are related to snails.
Arms and tentacles
Octopuses use their tentacles for gripping, touching and tasting. Squids also use their 2 arms and 8 tentacles for these purposes. Suckers on the bottom of these arms and tentacles help them to keep a hold of their prey and force the prey into its beak-like mouth.
Jet propulsion
To make a quick escape from predators, octopuses and squids may use jet propulsion. They suck water into a sack behind its eyes, then squirt it out. As the water shoots out backwards, the force pushes the animal forward.
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