00:00New research has found Atlantic ghost crabs' stomachs growl, and it's not because they're
00:09hungry.
00:10Scripps Institution of Oceanography researchers discover they use teeth in their stomachs
00:15to growl at enemies.
00:17It sounds crazy, but listen to this.
00:23Ghost crabs don't have teeth in their mouths, but they have some chompers in their gastric
00:27mill, or gut.
00:28They're usually used to munch on food, but researchers found they also use them to scare
00:33predators in hostile situations when their pincers are occupied.
00:37The crabs make aggressive sounds with their pincers, too, but the team noticed another
00:41sound while studying them.
00:43They couldn't see where it was coming from externally, so they looked internally with
00:47an x-ray and found the vibrations in the gastric mill.
00:52Researchers say it's the first evidence of an animal using stomach sounds to communicate.
00:56The findings were published in the Proceedings of the Royal Society B, Biological Sciences.
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