crabs, steamed hairy crabs, fried rice cakes with swimming crabs , spicy fried crabs, raw choking crabs... The saliva has begun to secrete.
Have you ever eaten "ghost crab"? The
ghost crab, a species of sand crab family, is a crustacean crab that lives on the Atlantic beach, and is also known as the Atlantic ghost crab.
How scary is it to be associated with "ghosts" and "ghosts"? Witnesses once said that they had seen many crabs, but it was the first time that they heard such a harsh sound from crabs. The sound did not come from the claws. The
scientists believe this is a defense mechanism, a warning.
When threatened, crabs make different sounds depending on the distance from the predator. If a potential predator is far away, it will first make a sound with its claws, but if the danger is getting closer, it will make this sound and enter a state of ready combat.
Where did the horrible sound come from?
To determine the source of these sounds, scientists stimulated subjects with sticks, dead crabs and robotic insects, and combined X-ray imaging and shock-sensing lasers to monitor angry crabs.
Ultimately, an analysis of the results showed that the growl came from the crab's gut, specifically thanks to a mechanism called gastric grinding, a feature that allows the crustacean to move without teeth. Can handle food.
The growl is not only a defense mechanism, but also a means of communication.
First of all, the sound comes from the friction of the stomach teeth, so the food can be ground in the foregut.
Second, is a warning, providing a second layer of protection in combat for crabs. Raising its claws while making a roar is definitely an advantage if predators are in close proximity.
Others, the size of the sound, like the big pincers of a crab, is also a sign of fighting ability
Most importantly, it is an important way of communication.
Both male and female crabs use this type of communication during heated exchanges. When threats are far away, use the claws to send messages, and if a potential threat is "too close," communicate using stomach-tooth vocalizations. This is a very effective way to fight with your claws while continuing to communicate with your companions with your voice.
This is the first recorded example of animals using their stomach sounds to communicate. The
scientists believe that ghost crab-like roaring sounds may also be produced by other animals, and species with the same food-processing mechanisms, such as worms, mollusks, and birds, also use these traits to communicate.
Finally,
's understanding of ghost crabs still has many problems.
For example, how these sound signals affect other crabs and potential predators; how crabs, although they make sounds in experiments, use those sounds in their natural environment; and how crabs use sounds to communicate.
hope we get to know them soon.
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