Scientists have found they rub their teeth during aggressive encounters as part of 'unusual' communication system.
ShareGhost crabs have teeth in their stomachs that they use to growl at one another with, scientists have discovered. This"unusual" communication system, researchers say, is used during aggressive interactions—similar to the way dogs growl during hostile encounters.
"There are three main teeth—a medial tooth and two lateral teeth—that are essentially elongated, hard structures," Jennifer Taylor, from the University of California, Davis, told."They are part of the gastric mill apparatus in the stomach, where they rub against each other to grind up food."—the Atlantic ghost crab—produced a strange noise."We could hear the crabs 'growling' at us, but we could not see how they were producing the sound," she said.
These crabs have also evolved special structures on their claws that allow them to make warning sounds—meaning they have evolved two ways of acoustic communication. Taylor said their claws appear to be helpful for communicating to other crabs at a distance:"Perhaps to warn off competitors or other threats before they get too close.
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