https://en.m.wikipedia.org/wiki/Simile
It's a simile. The word "like" is often used.
It means the stomach does not follow the brain. And the stomach wants to swallow food to large for it to digest. A snake swallowing a cow.
https://m.youtube.com/watch?v=l9Gk1upcItE
Snakes do eat animals too large. Here's a video of a snake regurgitating a cow.
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