I kept a ringneck snake for a while. Cutest little guy. He ate lizards, green tree frogs, slugs. He did not like crickets or mealworms or waxworms. He was a carnivore. The thing I did not like is they eat their prey without constricting it first so it was alive as he ate it. Garter snakes do the same thing, they do not constrict their prey either.