A recent science news video shows barium-marked fluoroscopy of a ghost crab’s gut teeth in action. The video reveals how that species of crab can control friction of its gastric mill teeth (i.e., teeth inside its digestive gut) in order to communicatively project growling noises.1 Gut teeth are well-known as components in crab digestive systems, since crabs (like lobsters and crayfish) have no teeth in their mouths.
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Source: icr.org
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