Ghost crabs use teeth in stomachs to 'growl' at predators
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Ghost crabs, named for their sand-pale bodies and nocturnal antics, use teeth in their stomachs to “growl” at aggressors, leaving their claws free for attacking manoeuvres and general waving about.
It is the first known evidence of an animal using the sounds of its stomach to communicate, the researchers say.
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Most crabs make noises called stridulations by rubbing their pincers together. The rasping comes from ridges or bristles that run up and down each claw.
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Crabs possess unusual apparatus to help them process food. Inside their stomachs are little teeth that together form what is known as a gastric mill. In ghost crabs, the mill has a central tooth flanked by neighbours that carry their own fine comb-like teeth. A complex arrangement of muscles and nerves sends the mill into motion, allowing crabs to shred food that has already passed into their stomachs.
https://www.theguardian.com/science/2019/sep/11/ghost-crabs-use-teeth-in-stomachs-to-growl-at-predators
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