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Message: <blockquote data-quote="Diamondsho89" data-source="post: 232506" data-attributes="member: 38712">I believe the dragging of the fang across your skin is an attempt to "catch" a spot that a fang can sink into.  "WAIT", before you just dismiss me....let me explain.A tarantula has no real mass to use to drive those fangs directly downward, hence they raise up to grab and pull an object to them to bite either as a threat or a prey item.  If a T is walking on your arm biting you would be about as easy as biting the soil you walk on.  Remember, a mygalmorph cannot "pinch" with their fangs to achieve penetration into the skin as araneomorph spiders can.  Fang orientation has a lot to do with this.  Araneomorph fangs are oriented side to side and can exert a pinching force while the mygalmorph fang is oriented forward facing and arcs outward and back upwards.  This means the mechanics needed to penetrate a larger solid surface not capable of fitting inside the arc of the flexion/extension of the fang is challenging at best and that's why your T is dragging a fang across your skin and not biting you directly.</blockquote>