Sorry to hear about the death of your bluebird offspring. You can buy various guards that extend the opening or have exposed ends of chicken wire over the opening. This keeps the baby bluebirds safe from raccoons, cats, squirrels , etc. I don’t know about snakes. (The exposed chicken wire ends would do a number on the them, though.) if it was other birds the guards might not help. Check some of the bird house suppliers. For example, Duncraft out of New Hampshire has a number of bluebird houses with different types of guards.
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