![]() When this happens, the entire octopus changes color -a trick it can perform faster than any other color-changing animal. ![]() Surrounded by muscles that, when contracted, can balloon the packet to many times its original size. The octopus attaches the suction cups by placing them on the surface it wishes to cling to, and then tightening the tiny muscles at the top of each sucker, producing a vacuum effect.Įach of the octopus ’s skin cells contains a packet of pigments (red, yellow, blue, brown, and black) These cups are powerful it requires 6 oz (170 g) of force to remove a single attached cup (of typical size), so the combined suction power of dozens of suckers makes a very secure grip. The octopus has eight legs, lined with double rows of suction cups, that encircle its parrot-like beak. ![]() The eyes are one of the octopus ’s most striking features, and are comparable in complexity and design to human eyes. The body of the octopus is rounded, like a head, and positioned, apparently, “above ” the octopus ’s eyes, which makes it look even more head like. The octopus has no hard, protective shell instead, its boneless body is covered by the soft mantle. Octopi are found in every ocean of the world, ranging in size from a tiny Philippine species barely an inch across to giant specimens that measure as much as 13 ft (4 m) in length and weigh 165 lb (75 kg). Octopi are cephalopod mollusks which are generally considered to be the most advanced members of the class. The octopus is an invertebrate in the phylum Mollusca (the mollusks), class Cephalopoda, which also includes nautilids, cuttlefish, and squid.
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