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Octopuses are highly intelligent, likely more so than any other order of invertebrates. The exact extent of their intelligence and learning capability is much debated among biologists, but maze and problem-solving experiments have shown that they show evidence of a memory system that can store both short- and long-term memory.
Hawaii Day Octopus (He'e)
The Hawaiian Day Octopus (Octopus cyanea) is the most common octopus in Hawaii. A member of the same phylum as the clam (Mollusca), octopuses are noted for their remarkable intelligence, their ability to change color instantly, the cloud of ink they release to cover their exit, and their ability to compress themselves through tiny cracks. Octopuses mate by transfer sperm using a special arm (its hectocotylus arm) to insert the sperm into the female’s mantle cavity. After the females lay their eggs, the females of many octopus species then guard them until they hatch. In most species, the octopus mates once, when about a year old, then dies. Hundreds of octopus species exist, from a half-inch long to 30 feet long. The larger ones start bigger, grow quickly and live two, maybe three years. Hawaii's small day octopus lives only about one year. Jacques Cousteau once said : "In the water the octopus looks like a silken scarf floating, swirling and settling gently as a leaf on a rock, the color of which it immediately assumes. ... The whole process is reminiscent of a ballet ... somehow ethereal, and at the same time elaborate, elegant and slightly mischievous.