You may not see it flicking hairs because you have a calm new world species. Even if they don't flick at you, they still use those urticating hairs to cover home base as a deterrent against predators. The bald spot is perfectly normal and once your tarantula molts it will be full of hairs again. If you notice the bare area getting darker that's normal too and just indicates your spider should be molting soon. Try to steer towards females if lanky spiders freak you out - males get quite a bit leggier on their ultimate molt. Sadly, surviving a post ultimate molt is rather rare so you get a bit of a visual warning that the end is nigh for those mature males.
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