Cephalopods

Colossal squids have an ink sac, so they have ink. However, not much is known about the ink.

For further information, check out New Zealand's TePapa Museum site about the colossal squid: http://squid.tepapa.govt.nz/anatomy/article/colossal-squid-the-inside-story


Quote from the site: "All squid have a sac of ink inside the mantle. The ink is a dark liquid and is expelled through the funnel. If the squid meets a predator, it shoots out a cloud of ink, which hides the squid so it can escape. No one has ever seen a colossal squid producing ink so we can't be sure what the ink looks like or how the squid uses it. As there is no light down at 1,000 metres in the ocean, dark ink would be useless! It is possible that the colossal squid has luminescent ink."

Cuttlefish are in fact invertebrates. This is because they are not actually fish, as their names hint. Cuttlefish are mollusks, and are in the same group of animals as species such as octopuses or squid.

Squid eat fish. They are carnivores. They catch the fish with one of their long arms and pull it to their mouth. Squid have a hard beak like a parrot's.

gastropods include species like snails and slugs

chephalopods include octopus and squid

Bivalves are organisms like clams, mussles and oysters

It depends on which type of octopus you are refering to. Generally, as the name implies, octopuses have eight arms(NOT tentacles like those of the squid); the bottoms of these are covered in suckers used to catch prey and grip things. In the middle of the arms is a parrot-like beak used to crush and eat shells of prey. The beak is the hardest part of the body, which allows the animal to squeeze into the smallest of spaces. The head/mantle is the main part of the body and holds all of the creature's organs. Octopuses have three hearts, and blue blood; the color of the blood is due to the lack of red blood cells and abundance of plasma. They also have gills and a jet propulsion siphon. Many can change colors to suit their environment and help camouflage themselves. Most can squirt ink to escape predators. Some are capable of losing limbs and later growing them back. The reproductive organ of the male octopus is located in one of its arms. It is inserted into the mantle cavity of the female to reproduce. Octopuses are actually regarded as the smartest invertebrate Beyond all this, check the Wikipedia article here: http://en.wikipedia.org/wiki/Octopus

No, They have tentacles - like an octopus.

There are many different species of octopus -

the smallest is the Octopus Wolfi, which is found in the Indo-Pacific Ocean. It is 1.5 centimeters in length.

The largest is the Pacific Giant Octopus which can weigh 150 pounds and stretch 30 feet across in only two years

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• The squid is known as the ice cream cone of the sea because they are a favorite food of many ocean dwellers.
• All squids are carnivores.
• the colossal squid, mostly known as the giant squid, eat whales when he can "take them down".
• Squid can live in fresh water, and saltwater.
• Squids can range from 24 inches long to more than forty feet long!

They're more shy than aggressive, although they do attack sometimes. I don't think they are as aggressive as squid.

You can kick the top of the head or you can bang your elbow on both side of the tentacle.

Like vertebrates, cephalopods can focus their eyes. Cephalopod vision is acute, and training experiments have shown that the common octopus can distinguish the brightness, size, shape, and horizontal or vertical orientation of objects.

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I just read an article in National Geographic News that said that a new study, done April 2009, showed that all octopus, cuttlefish, and some squid are venomous. Here's the link: http://news.nationalgeographic.com/news/2009/04/090417-octopus-venom.html

Yes, they can. They do it so they can stay away from predators such as some tropical sharks. Color change is also used in communication and to attract mates.

Octopuses or octopodes. The Anglicized (and most common) plural form of octopus is octopuses. Although it is often supposed that octopi is the 'correct' plural of octopus, and it has been in use for longer than the usual Anglicized plural octopuses, it in fact originates as an error. Octopus is not a simple Latin word of the second declension, but a Latinized form of the Greek word oktopous, and its 'correct' plural would logically be octopodes.

There are exactly 289 different octopus species. Here is some more information about octopuses and their different species: http://en.wikipedia.org/wiki/Octopus -GLOWSTICK.

no, in the deep oceans of Tropical areas. Alternative answer: There are many different varieties of Octopus and they are found in most of the seas and oceans of the world, from the tropics to the polar regions and at all depths from coastal shallows to mid ocean.

Well, it pays taxes and can be recruited in times of war as an underwater special forces unit. And many people believe that the octopus is good at physics - but this not true, its hard beak prevents it from fully grasping physics, particularly the laws of thermodynamics.

What kind of a question is this - What does an octopus for the environment? i can only hope that this quesiton is part of a 3rd grade exam, and not a person over 12 asked this question.

What does any animal do for the environment? It exists. It eats shellfish and crabs, it reproduces. It is probbaly one of the smartest living creatures on earth - able to change color and texture, and can even survive outside of water for some time. It tends very carefully to its young, a careful parent - and dies upon their birth.

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they penetrate each other

Yes. There is a located near the eyes of the octopus. Although it doesn't look like the mammalian brain that we know, it serves many the same functions that our brains do. There are also concentrations of ganglia (concentrations of neurons) in their arms - in fact 2/3 of the octopus's neurons are in their arms - so sometimes these often continue to move even after severed from the octopus body.

Interestingly, cephalopods (octopuses, squids, cuttlefish, and nautiluses) all exhibit high intelligence. Octopuses have been known to break out of aquarium tanks, and some studies indicate that they may even have personalities, which would be very unusual for an invertebrate animal.