Giant Pacific Octopus (Enteroctopus dofleini)

Chameleon-like, giant Pacific octopuses can change their appearance to mimic rocks and highly patterned coral.

Photograph by Bob Cranston—Animals Animals - Earth Scenes

The giant Pacific octopus grows bigger and lives longer than any other octopus species. The size record is held by a specimen that was 30 feet (9.1 meters) across and weighed more than 600 pounds (272 kilograms). Averages are more like 16 feet (5 meters) and 110 lbs (50 kilograms).

They live to be about four years old, with both males and females dying soon after breeding. Females live long enough to tend fastidiously to their eggs, but they do not eat during this months-long brooding period, and usually die soon afterwards.

Giant Pacific octopuses have huge, bulbous heads and are generally reddish-brown in color. Like the other members of the octopus family, though, they use special pigment cells in their skin to change colors and textures, and can blend in with even the most intricately patterned corals, plants, and rocks.

They hunt at night, surviving primarily on shrimp, clams, lobsters, and fish, but have been known to attack and eat sharks as well as birds, using their sharp, beaklike mouths to puncture and tear flesh. They range throughout the temperate waters of the Pacific, from southern California to Alaska, west to the Aleutian Islands and Japan.

Highly intelligent creatures, giant Pacific octopuses have learned to open jars, mimic other octopuses, and solve mazes in lab tests. Their population numbers are unknown, and they do not currently appear on any lists of endangered or vulnerable animals. However, they are sensitive to environmental conditions and may be suffering from high pollution levels in their range.

Map

Giant Pacific Octopus Range

Fast Facts

Type:

Invertebrate

Diet:

Carnivore

Average life span in the wild:

3 to 5 years

Size:

9.75 to 16 ft (3 to 5 m)

Weight:

22 to 110 lbs (10 to 50 kg)

Did you know?

The appendages of octopuses are called arms, not tentacles.

Size relative to a 6-ft (2-m) man:

Source : http://animals.nationalgeographic.com/animals/invertebrates/giant-pacific-octopus/

Valcano

A volcano is a place on the Earth's surface (or any other planet's or moon's surface) where molten rock, gases and pyroclastic debris erupt through the earth's crust. Volcanoes vary quite a bit in their structure - some are cracks in the earth's crust where lava erupts, and some are domes, shields, or mountain-like structures with a crater at the summit.

Magma is molten rock within the Earth's crust. When magma erupts through the earth's surface it is called lava. Lava can be thick and slow-moving or thin and fast-moving. Rock also comes from volcanoes in other forms, including ash (finely powdered rock that looks like dark smoke coming from the volcano), cinders (bits of fragmented lava), and pumice (light-weight rock that is full of air bubbles and is formed in explosive volcanic eruptions - this type of rock can float on water).

Volcanic eruptions can cause great damage and the loss of life and property.

The Word Volcano:

The word volcano comes from the Roman god of fire, Vulcan. Vulcan was said to have had a forge (a place to melt and shape iron) on Vulcano, an active volcano on the Lipari Islands in Italy. 

Extreme Volcanoes:

The largest volcano on Earth is Hawaii's Mauna Loa. Mauna Loa is about 6 miles (10 km) tall from the sea floor to its summit (it rises about 4 km above sea level). It also has the greatest volume of any volcano, 10,200 cubic miles (42,500 cubic kilometers). The most active volcano in the continental USA is Mt. St. Helens (located in western Washington state).

The largest volcano in our Solar System is perhaps Olympus Mons on the planet Mars. This enormous volcano is 17 miles (27 km) tall and over 320 miles (520 km) across.