Ah, someone's been doing their homework
Most New World (the Americas) tarantulas can indeed defend themselves by kicking off urticating bristles from their "butt" (although some prefer to press themselves onto the intruder, like Avicularia spp., and the genus Ephebopus has their urticating hairs on pedipalps)
Fan of spiders? too bad that spider import/export is illegal in Australia.