Wax worms and hornworms can be small, neither can be fed as moths since they are way to big and I would think they would be hard for the snake to catch. Waxworms are around 3/4" in length and small hornworms are like 1.5" in length, both are under 1/2" thick, waxworms being thinner. Waxworms can be kept in temperatures at 55F and last for 8 weeks until pupating, I’ve had luck keeping them at around 48 but the survival rate is higher if they are kept warmer, hornworms grow extremely fast and can be kept in the fridge as long as they are only in the fridge every other day or less, the fridge would slow down their growth but they would still need fed very quickly, a dozen would probably need to be fed in under a week so they don’t get too big.
Mealworms shouldn’t be fed often because they are high in chitin, dubias are soft-shelled insects not hard-shelled, they don’t have much chitin which is why they’re such a good leopard gecko staple feeder and would work for green snakes.
As far as size comparisons, normal mealworms(not giant) are similar length to wax worms but the wax worms are a lot plumper. In comparison to giant mealworms, wax worms are shorter but under twice the thickness, also wax worms are squishy so they look a little bit bigger than they actually are.
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