The largest of the octopus species is the Giant Pacific Octupus. Their 8 arms are covered with 2, 240 suction cups for females and about a 100 fewer for males. The biggest of this species that was ever record was 30 feet across and weighed over 600 pounds.
The smallest is the Octopus Wolfi which is only 1.5 centimeters in length.
The octopus is a cephalopod meaning boneless invertebrates. There are 289 different octopus species. Octopuses are characterized by their eight arms (not tentacles), usually bearing suction cups.
Octopuses have three hearts. Two pump blood through each of the two gills, while the third pumps blood through the body. Their blood contains copper-rich protein hemocyanin that gives their blood blue in color. Like any other octopuses, their main defense is their ink sac and camouflage.
Tip! Learn more facts about octopuses from OneKind.