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They are native in most areas of the US, but we kick start them each year by buying 100 cocoons for each of the nesting blocks. When we get better at harvesting cocoons and storing them over the winter we shouldn't need to buy them any more. Eventually we would like to generate a little revenue off of them by selling some cocoons.

Oh its like cocoons family you buy, then enlarge the family size and then help others by selling some portion of it - interesting.