| 1. | They may stridulate, or vibrate the objects they are on.
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| 2. | Most spiders are silent, but some tarantula species are known to stridulate.
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| 3. | The vestigial tegmina are horny, almost without veins, and without stridulating organs.
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| 4. | The three species of the genus stridulate by rubbing setae on their pedipalps and legs.
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| 5. | Some scorpions in addition produce deimatic noises by stridulating with the pedipalps and first legs.
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| 6. | This hissing is produced by the spider stridulating a patch of setae associated with its chelicerae.
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| 7. | Both sexes are able to stridulate.
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| 8. | Younger individuals may be identified through the examination of their stridulating ridges and the shape of their gonopods.
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| 9. | These sounds are produced mainly by males to attract females, though in some species the females also stridulate.
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| 10. | The palm of the claws also possess stridulating ( sound-producing ) ridges which they use for communication.
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