Once they’re fully grown their digestive system resembles a nuclear reactor more than a stomach and they eat literally anything and can get energy out it. Even sand.
I think sandworms can get big enough to hear their own noise and try to eat themselves. Just deep desert stuff
I heard of a sandworm that had one of its ring segments surgically removed so that it could eat its own tail
But like, if you’re standing on a rock or something, you’re safe.
TIL my dog is a sandworm.
I assume they get most of their nutrition from filtering stuff out of the sand, like baleen whales scooping krill out of the ocean, and humans are just their favorite treats. They can’t get enough of those delicious, delicious people, and who can blame them?