Pretty close, they eat unicorns, fairy’s, and other creatures with magical powers. Their droppings consist of these strange clumps that turned out to be butterfly cocoons. They have to be in the cocoon for a month so sadly most had been thrown away, a few managed to escape garbage. Once scientist connected the butterfly’s to the snakes rainbow boa keepers started keeping them and selling the cocoons for high prices to butterfly houses and collectors(this of course brought upon a black market of stuffing the poor boas so they pooed a lot more then normal, really horrible and it has been banned in the usa).
I would love a rainbow boa but the price of feeding it is so expensive and few mythological breeders are willing to sell their animals as food. It cost about 8,000 a month to feed them twice! Some keepers have started breeding a small subspecies of the Norway troll to feed their boas, they’re rare in the wild but breed readily in captivity. A breeding pair will usually cost around 13,000 while a immature pair is only 3,000.