My partner has a hedgehog, and we feed her mealworms. So I was terrified when, scrolling through Boing Boing, I saw the headline "Dinner's Revenge: mealworms that survive in the stomach, then eat their way out of predators." The author, Mary Roach, takes a long time getting to whether or not it happens, as explored by some scientists doing some casual experimenting. But I'm not worried about Violet -- she chews her food.
As so often is the case with apocryphal tales like this, finding someone who knows someone who’s seen it is easy. Less easy is tracking down an actual eyewitness. One who claims to have seen is John Gray, the animal care technician at the Tracy Laboratory at the University of Nevada, Reno. His boss, Richard Tracy, is a physiological ecologist. [...] Eighteen lizards, forty toads, and fifty frogs are under John Gray’s care, but he has not seen it happen to any of them. It happened to a fence lizard he caught in his backyard as a twelve-year-old. He recalls feeding a superworm to his new pet in the evening, and finding the lizard dead the next morning with the superworm “hanging out of its side.”
Tracy is skeptical. He has a theory that the story took root in the public’s consciousness with the 1979 release of Alien, a film in which the title character hatches inside one of the crew and breaks through the skin of the man’s abdomen during a meeting.