system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 Why does our stomach makes a sound when hungry? And are we the only animals do that, if yes, why?
gpt
It isn't so much that it makes a sound to tell you you're hungry, it's that it happens often *at the same time* that you're hungry, so you associate the sound with the feeling. When your intestines are not full of food and digestive juices, there is relatively more air inside them. When they squeeze what little fluid there is, it's kind of like the sound of a dripping faucet echoing in a big empty sink. All the air inside instead of fluid makes it easy for you to hear. It probably happens in animals too, but whether they notice or not is a good question.