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Most Spiders who's bite is capable of penetrating human skin, make two puncture marks close together, as this is the way that their jaws are structured- they are called mandibles, and are shaped like opposing prongs that clench together horseshoe-fashion, a bit like the way some sorts of pliers are shaped. But in many cases, the bite is so small that it's difficult to see the two separate puncture marks- it all looks like one unless seen under a magnifying glass. It should be mentioned though, that although most big tarantulas and bird-eating spiders can inflict a sharp bite, very few if any of the big species are poisonous to humans- it is the smaller varieties, such as the North American Black Widow and the Australian Funnel Web, whose bite is dangerously venomous.

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7y ago

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