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They may stridulate, or vibrate the objects they are on.
Insects and other arthropods stridulate by rubbing together two parts of the body.
Some setae are used to stridulate, which makes a hissing sound.
Males stridulate which attracts females to their location.
Most spiders are silent, but some tarantula species are known to stridulate.
This is one of only a few Theraphosid spiders that can stridulate as a major defense mechanism.
Both sexes are able to stridulate.
Some species can stridulate.
When attacked from the side, males will stridulate and both sexes will attempt to bite the attacker.
A number of species of venomous snakes are known to stridulate as part of a threat display.
Individuals stridulate to dissuade other hydropsychids from attempts to steal their retreats.
The males in this species stridulate, rubbing their forewings over each other, creating enough friction to produce a "song".
The green grasshoppers and katydids stridulate by means of special organs at the base of the fore wings.
Many grasshoppers stridulate by rubbing the hind legs across strong nervures on the fore wings.
Other species communicate with sounds: crickets stridulate, or rub their wings together, to attract a mate and repel other males.
However, another source notes that Tetrigidae do not have tympanums and are unable to stridulate, but still display courtship behaviours for the female.
Males stridulate more commonly than females by expanding the hind wings against the closed forewings, thus flashing the bright red hindwings.
These sounds also function as tactile communication, or communication through touch, as they stridulate, or vibrate a substrate like leaves and stems.
The 4-segmented legs are well-developed; the front legs are used to stridulate by rubbing against the margin of the epipharynx, a habit unique to this family.
Above the water's surface, grasshoppers and crickets stridulate; that is, they rub one part of their body across another to produce 'those fiddling tunes so evocative of summer'.
'op began to stridulate her mouthparts and wave her tentacles, lifting her front segment up vertically until it had nearly reached its full three-meter length.
Once the female beetles have arrived on a suitable pine tree host, they begin to stridulate and produce aggregative pheromones to attract other unmated males and females.
As the males arrive, they enter the galleries that the females have tunneled, and begin to stridulate to let the females know they have arrived, and to also warn others that the female in that gallery is taken.
While this "spoon-and-washboard" anatomy is a well-known sound-producing apparatus in insects (see stridulation), it had not been well documented in vertebrates (some snakes stridulate too, but they do not have dedicated anatomical features for it).
Intelligent aliens could communicate through gestures, as deaf humans do, by sounds created from structures unrelated to breathing, which happens on Earth when, for instance, cicadas vibrate their wings or crickets stridulate their wings, or visually through bioluminescence or chromatophore-like structures.