What is the average size of an octopus?

Octopuses vary in size according to species, but the common octopus grows between 12 and 36 inches in length and weighs up to 22 pounds. The giant Pacific octopus is the largest of member of the octopus family and can weigh more than 150 pounds.

The giant Pacific octopus lives in waters of the North Pacific. This octopus generally prefers colder water and can be found at depths of 6,000 feet or more. Like other octopuses, the giant Pacific octopus subsists on a diet of crustaceans, mollusks and fish. Adult giant Pacific octopuses are preyed upon by sperm whales, harbor seals and sleeper sharks. Octopuses are considered by many scientists to be the most intelligent invertebrates on the planet.