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A recent science news video shows barium-marked fluoroscopy of a ghost crab’s gut teeth in action. The team found that the crab's gastric mill contain sideways teeth with a series of comb-like structures that can rub against the mill's middle tooth. They say it’s the first evidence of an animal using stomach sounds to communicate. A particularly grumpy type of crab scares off predators by growling at them using teeth in its stomach, new research has revealed. Depending on the species of crustacean some have ossicles or calcified plate-like structures in the stomach (much like the flat surfaces of molars) while others have chitenous gastric teeth. Ghost crabs use their “stomach teeth” in a secondary fashion as well. Crabs are mostly active animals with complex behaviour patterns. Scientists in the US have discovered a species of crab that uses teeth located inside its stomach to growl at enemies. A crab’s stomach is split into two parts – the first houses three strong teeth to grind up the food they eat, strong enough to grind up hard and gritty material, including shells. Apart from that, another sound comes from the internal body of a crab. Chiten is the same material that the arthropods shells are made out of, and is very strong. The sounds … The University of California conducted a study that was published in the Proceedings of the Royal Society B: Biological Sciences, looking at the behaviour of the Ocypode quadrata, commonly known as a Ghost Crab. This new discovery about the crab, published today in the Royal Society B journal, is the first evidence of an animal using its stomach to communicate. The teeth are part of a system called the “gastric mill.” Through rhythmic movements of these large teeth, of which there are three, their stomachs can actually crush food as a prelude to further digestion. Scripps Institution of Oceanography researchers found Atlantic ghost crabs use teeth in their stomachs to growl during aggressive interactions. Initially, the teeth in the stomach assist crabs in breaking down food. Till now, the reason behind the inner sound remained unclear. The researchers from the University of California stimulated these raspy reactions by taunting the crabs with dead and live ghost crabs, a plastic toy crab and a remote control robotic toy. When crabs feel risky, they make grumbling noise using teeth in the stomach. Listen to the these Ghost Crabs growl at predators using teeth in their stomach From the Watch Now: Adorable cheetah cubs play at San Diego Zoo, and more of today's top videos series They can communicate by drumming or waving their pincers. This time, scientists have solved the mystery. Scripps Institution of Oceanography researchers found Atlantic ghost crabs use teeth in their stomachs to growl during aggressive interactions. 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