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    October 8, 2019

    Let's celebrate cephalopods

    For World Octopus Day, we're lighting up your screen with a shot of a nocturnal octopus from the genus Callistoctopus in its larval stage. It was photographed on a night dive near the Big Island of Hawaii. You may not consider octopuses cute and cuddly, but they have charisma to burn. The highly intelligent species has been observed solving puzzles, unscrewing lids, and even using tools. One study recorded octopuses collecting discarded coconut shells and carrying them back to their dens to use as shelter. In another incident that made headlines, an octopus named Otto taunted staff at his aquarium by repeatedly crawling out of his tank to shoot water at the overhead lights, causing them to short-circuit. Octopuses aren't all brains—they've got heart as well (three, in fact!). The more we learn about this species, the more impressed we are. Can't every day be World Octopus Day?

    Quote of the day

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  1. http://en.wikipedia.org/wiki/Octopus

    7k彩票平台代理The octopus (plural octopuses) is a soft-bodied, eight-limbed mollusc of the order Octopoda (/?kt?ɑ?p?d?/, ahk-TAH-p?-d?). Around 300 species are recognised, and the order is grouped within the class Cephalopoda with squids, cuttlefish, and nautiloids.

    Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the center point of the eight limbs ("tentacle" is used as an umbrella term for cephalopod limbs; however, within a teuthological context, "arm" is used to refer to such limbs while "tentacle" is reserved for feeding appendages not found on octopuses). The soft body can rapidly alter its shape, enabling octop…

    Like other cephalopods, the octopus is bilaterally symmetric with two eyes and a beak, with its mouth at the center point of the eight limbs ("tentacle" is used as an umbrella term for cephalopod limbs; however, within a teuthological context, "arm" is used to refer to such limbs while "tentacle" is reserved for feeding appendages not found on octopuses). The soft body can rapidly alter its shape, enabling octopuses to squeeze through small gaps. They trail their eight appendages behind them as they swim. The siphon is used both for respiration and for locomotion, by expelling a jet of water. Octopuses have a complex nervous system and excellent sight, and are among the most intelligent and behaviourally diverse of all invertebrates.

    Octopuses inhabit various regions of the ocean, including coral reefs, pelagic waters, and the seabed; some live in the intertidal zone and others at abyssal depths. Most species grow quickly, mature early, and are short-lived. In all but one known species the male uses a specially adapted arm to deliver a bundle of sperm directly into the female's mantle cavity, after which he becomes senescent and dies, while the female deposits fertilised eggs in a den and cares for them until they hatch, after which she also dies. Strategies to defend themselves against predators include the expulsion of ink, the use of camouflage and threat displays, the ability to jet quickly through the water and hide, and even deceit. All octopuses are venomous, but only the blue-ringed octopuses are known to be deadly to humans.

    Octopuses appear in mythology as sea monsters like the Kraken of Norway and the Akkorokamui of the Ainu, and probably the Gorgon of ancient Greece. A battle with an octopus appears in Victor Hugo's book

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  2. http://www.britannica.com/animal/octopus-mollusk

    Octopus, plural octopuses or octopi, in general, any eight-armed cephalopod (octopod) mollusk of the order Octopoda. The true octopuses are members of the genus Octopus, a large group of widely distributed shallow-water cephalopods. (See cephalopod.)

  3. People also ask
    What are facts about octopus?
    Found worldwide in the shallow waters of tropical, subtropical, and temperate areas, the common octopus is a fascinating creature. At 60-90 cm (24-36 in.) long, it has eight long limbs protruding from a globe-shaped head (or mantle). Two rows of suckers line their tentacles and can sense taste.

    Why do Octopus have so many arms?
    The reason octopuses and squids have eight arms is that it allows them to do all kinds of helpful things! For example, octopuses are able to detach one of their arms from their body if the arm is caught by a predator!

    What is special about an octopus?
    An octopus sees the same thing upside down as right-side up. The large and complex eyes of an octopus help it to perform the two functions most necessary for survival: finding food and avoiding trouble. While most of the rest of the creature's body is quite flexible in the water, the eyes are more solid.

    mentalfloss.com/article/20445/8-octopus-facts-one-each …
    What is the difference in a squid and octopus?
    The basic difference between a squid and octopus is that a squid lives in the open oceans and prefer to live on the upper surface of the water, whereas octopus lives in the dens in the oceans and prefer to live under deep dark water. Both of them have eight arms each as they both are cephalopods.

  4. http://www.nationalgeographic.com/animals/invertebrates/c/common-octopus

    May 10, 2011 · Common Octopus The common octopus7k彩票平台代理 would be unique for its appearance alone, with its massive bulbous head, large eyes, and eight distinctive arms. But by far the most striking characteristic of the...

    • Author: Joel Sartore
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    • http://www.thoughtco.com/fascinating-octopus-facts-4064726

      Dec 13, 2019 · Octopuses (Octopus7k彩票平台代理 spp.) are a family of cephalopods (a subgroup of marine invertebrates) known for their intelligence, their uncanny ability to blend into their surroundings, their unique style of locomotion, and their ability to squirt ink.

    • http://www.thefreedictionary.com/octopus

      1. (Animals) any cephalopod mollusc of the genera Octopus, Eledone, etc, having a soft oval body with eight long suckered tentacles and occurring at the sea bottom: order Octopoda (octopods) 2. 3.

    • octopus
      octopus (noun) · octopuses (plural noun)
      1. a cephalopod mollusc with eight sucker-bearing arms, a soft body, strong beaklike jaws, and no internal shell.
      mid 18th century: modern Latin, from Greek oktōpous (see Octopoda).
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    • http://www.merriam-webster.com/dictionary/octopus

      Kids Definition of octopus7k彩票平台代理 : a marine animal that has a soft rounded body with eight long flexible arms about its base which have sucking disks able to seize and hold things (as prey) Keep scrolling for more More from Merriam-Webster on octopus

    • http://kids.nationalgeographic.com/animals/invertebrates/octopus

      The octopus can also change to gray, brown, pink, blue, or green to blend in with its surroundings. Octopuses may also change color as a way to communicate with other octopuses. Octopuses are...

    • http://www.livescience.com/55478-octopus-facts.html
      • The order Octopoda includes 289 species, according to the World Animal Foundation. The word also refers specifically to animals in the genus Octopus. The word octopus comes from the Greek, októpus, which means \"eight foot,\" according to a Smithsonian magazine article that summarized facts in Katherine Harmon Courage's book, \"Octopus! The Most Mysterious Creature in the Sea.\" Some people call their appendages tentacles, but that is incorrect; they are arms. Most octopus species have suction …
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