This young giant Pacific octopus (Enteroctopus dofleini) can use water jet propulsion to move quickly if disturbed. Seawater is drawn into the mantle cavity and with a strong muscle contraction forced out of its funnel, moving the octopus in the opposite direction.
The giant Pacific octopus has many thousands of colour changing cells called chromatophores that allow the animal to quickly blend into its environment. This octopus can also dramatically change its texture by controlling muscles just below the surface of its skin to further blend into their surroundings. Three small flaps below each eye of a Pacific red octopus differentiate it from this juvenile giant Pacific octopus. The giant Pacific octopus can grow to 10 feet (3 m) long, and weigh in over 100 pounds (45 kg), with a range that includes Korea, and the Bering Sea to southern California.
References:
Hall, Danielle. “Cephalopods” Smithsonian Ocean, Smithsonian Institution,2018, https://ocean.si.edu/ocean-life/invertebrates/cephalopods
Jensen, Gregory with Gotshall, Daniel and Flores-Miller, Rebecca. Beneath Pacific Tides: Subtidal Invertebrates of the West Coast. Bremerton: MolaMarine, 2018.
Meyer, Fox. “How Octopuses and Squids Change Color” Smithsonian Ocean, Smithsonian Institution,2013, https://ocean.si.edu/ocean-life/invertebrates/how-octopuses-and-squids-change-color
