I heard that sharks have 8 senses. Is this true? If so, what 3 senses do they have that we don’t?
400729
We have only three: photoreception (vision), chemoreception (smell and taste), and mechanoreception (touch and hearing). Similarly, sharks do not have 13 senses, they have four: the three we have plus electroreception.\n\nElectroreception is found in many marine and freshwater fishes, several amphibians, as well as a few mammals. These electrosensitive mammals include the 'primitive' egg-laying monotremes - the Platypus (Ornithorhynchus anatinus), the Short-Beaked (Tachyglossus aculeatus) and Long-Beaked (Zaglossus bruijni) Echidnas - and at least one 'higher' placental mammal, the Star-Nosed Mole (Condylura cristata). All vertebrates share a common ancestor. Since the ability to sense electric fields has re-appeared several times in discrete vertebrate lineages, electroreception must be a very ancient ability.
9529
Being a Great White Shark would be awesome...I'd be able to sense a heartbeat through the water, and I could smell blood a mile away. I'd never have to worry about dental care!
184692
Fishes have eyeballs, two of them in their optic capsules, just like all other vertebrates. They're surrounded partly by bone, and partly by an elastic but resistant capsule. \nBony fishes don't have eyelids, but sharks and rays do\n(see answer at \nhttp://answers.yahoo.com/question/index;_ylt=AqPoH8mhQReCU_CYDM1Fvirsy6IX?qid=1006030500996 )\n\nAnd they _do_ have nostrils, but, as you have rightly deducted, they're not used for breathing. \nIf you look at a bony fish (a goldfish or whatever you have at hand) you'll see that it has TWO nostrils on each side of its snout (they can be close together or really distant). Between these two nostrils of each side there is a tube with special olfactory (smelling) cells, like the ones we have in our own noses. The water with chemical "smell/flavor" molecules goes in through the anterior opening, and flows out through the posterior opening. Thus, fish nostrils (derived from the primitive pair of olfactory capsules) are used for smell/flavor perception, and not for breathing (which occurs at the gills). \nIt's only in tetrapods (from amphibians to reptiles, birds and mammals) that the connection between the nostrils and the respiratory system occurs (and the lungs appear). If you open a frog's mouth (please only try it with a dead animal!) you'll see two paired holes in the roof of its mouth. Those are the internal nostrils (called "choanae") and they allow passage of breathing air to the mouth--> pharynx--> lungs. \n\nAdditional trivia:\n- Our own internal nostrils open way back in our pharynx, because we have a secondary palate.\n- Cartilaginous fishes have only one nostril on each side of the snout. However, each nostril is partly separated into 2 parts by a flap of skin, and actually water flows through the nostril just as in bony fishes.\n- Some bony fishes, the cichlids (discus, Jack Dempsey), have only one nostril on each side of the snout.
97580
Easy. Sharks belong within the subphylum Vertebrata.
505831
Each of the arms of a starfish has an eye, but they cannot see with it, but they can tell day and night from it.\n\nAlso that means if a starfish has more than 5 legs it has more than 5 eyes.\nSome starfish DO have more than 5 legs\n\nTry this for a site about eyes\nhttp://www.ski.org/Vision/Eyepage/eyeposition.html
847239
No.\n\nFish can see in five colours. We can only see in three (although some women can see in four). Humans have a blind spot caused by the wiring of their retinas; octopuses do not. The resolution of human vision is not as good as that of hawks. A hawk's vision is about 20/5; they can see an object from about four times the distance of a human with 20/20 vision.\n\nAnd that's just the eyes.\n\nOur skin is not as thick and tough as a rhinoceros', so provides us no protection. It has no fur to keep us warm. We are not the fastest organisms. We are not the only organisms that know how to use tools (see Caledonian crows, some apes and beavers).\n\nAs far as evolution is concerned, if it survives, it's superior. If it doesn't survive, it's inferior. By that standard, all animals are superior, and by inference, all plants.
913635
omg fantastic, i love sharks and am hoping to cage dive next year, that clip was shown on sunday on planet earth i think, i missed it but my boyf was going on about it, thanks!
56757
Man-eating is reffering to humans. Sharks don't differentiate by gender. :)
81095
In addition to the classical 5 senses we can sense temperature, pain and equilibrium (balance).  We also have coutless other senses which work subconsciously to keep us alive (water, sugar, salt balance).
437882
Most dolphins have acute eyesight both in and out of the water and their sense of hearing is superior to that of humans. Though they have a small ear opening on each side of their head it is believed hearing underwater is also if not exclusively done with the lower jaw which conducts the vibrations to the middle ear via a fat filled cavity in the lower jaw bone. Hearing is also used for echolocation which seems to be an ability all dolphins have. The dolphin's sense of touch is also well-developed.\n\nHowever, dolphins lack an olfactory nerve and thus have no sense of smell, but they can taste and do show preferences for certain kinds of fish. Since dolphins spend most of their time below the surface in the wild, just tasting the water could act in a manner analogous to a sense of smell.
935047
1) holy crap you're asking that here? :P\n\n2) shark's tooth can hold a smaller sample.\n\n3) can get more lanes with a shark's tooth comb.
356432
hmmm... how would octupi kiss?\nIf they did it by touching tentacles, then there'd be 64 different ways (8^2), or if they touched all 8 tentacles, then there'd be 40320 different ways (8!).....(assuming they could tie themselves up a little bit!)...\nOr, maybe like the person above suggested, there's just one way...beak to beak!
551194
1st off the sharks are always there you may not see them but they are there I have been surfing manytimes and had a shark swim right by me fishing with live bait is not going to attract sharks un less its bigger and a very bloody bait they are attracted to large fish and bloody meat not little shrimp and shinners which is what wade fisherman use along with shrimp and such you are more likely to get worried if someone is using chicken to catch crabs then anything and then you are looking at a thigh not a whole chicken the blood could attract them but not likely I have doen it many times and not a single shark bite on my line
945627
when I was in my teens, I aspired to be a marine biologist. i had a good microscope at the time but i didn't make the connection between the two!!!  i used to scuba dive and in central Fl. I have been on reefs where i came within 10 ft. of a barracuda!! it just watched me as i watched it.  i made sure that i didn't have on any jewelry like bracelets, necklaces or any shiny things that may have caused it to assume i was a fish!  used to watch J. Cousteau (sic) all the time. recently, i was a fan of the late Steve Irwin.  i used to look at plankton under my microscope but didn't realize that the lowest part of the food chain sustained all of us.  I think marine microbiology is a vital occupation and i should have went in that direction going into college. hindsight is allways 20/20 as they say.   good question that brought back good memories so thanks.  BTW you know that SCUBA is an acronym for Self Contained Underwater Breathing Apparatus.
338831
The five senses. You may include sixth also.
366689
My friend Shane loves to tell tales of his shark attack. It was off the coast of New Zealand and this massive shark came up and after a wild struggle it bit off a huge chunk from his body....that's his tale. The truth is a small shark bit off the end of his pinky finger. He really doesn't have the end of his finger anymore. But he has suddenly developed at fingernail on the new tip. Weird.
517409
Fishes have well-developed nervous systems that organize around a central brain, that is divided into different parts. The most anterior, or front, end of the brain are the olfactory bulbs, which are involved in the fish's sense of smell. Unlike most vertebrates, the cerebrum of the fish is primarily processes the sense of smell rather than being responsible for all voluntary actions. The optic lobes process information from the eyes. The cerebellum coordinates body movements while the medulla oblongata controls the functions of internal organs. Most fishes possess highly developed sense organs. Nearly all daylight fish have well-developed eyes that have color vision that is at least good as a human's. Many fish also have specialized cells known as chemoreceptors that are responsible for extraordinary senses of taste and smell. Although they have ears in their heads, many fish may not hear sounds very well. However, most fishes have sensitive receptors that form the lateral line system. The lateral line system allows for many fish to detect gentle currents and vibrations, as well as to sense the motion of other nearby fish and prey. Some fishes, such as catfish and sharks, have organs that detect low levels electric current. Other fishes, like the electric eel, can produce their own electricity.