Lobsters Don't Scream When They're Cooked - So What Is That Sound?
Briefly

Lobsters have been the subject of various myths, particularly the idea that they scream when boiled alive. In reality, lobsters do not possess vocal cords or lungs, which means they cannot produce sounds. The noise that people interpret as a scream is simply steam escaping from their shells during cooking. Instead of vocalizing pain, lobsters display distress through physical reactions such as tail twitching and the release of cortisol. While they experience a form of pain awareness, they die quickly in boiling water, typically within 35 to 45 seconds.
When faced with physical harm, lobsters express their anguish by twitching their tails and releasing cortisol into the bloodstream, similar to humans when distressed.
The screeching sound made by lobsters in boiling water is actually steam escaping from their shells, not a scream, as lobsters lack vocal cords.
Read at Tasting Table
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