Here's what my friend Carole Sheridan has to say about raising meal worms. She ran the Tahoma Audubon Bird Clinic for over 30 years. ^^^^^^^^^^^^^^^^^^^^^^^^^ Helen, I really don't know much about raising meal worms, I didn't like having them around, so bought them when I needed them. I do remember when I did have them I had them in a container with a kind of bran meal, along with an apple slice . I don't know about the tight lid, as moisture could collect and then we have a smelly, damp mess. I know you can buy them very reasonably. Care Delew buys them for the Bluebirds. She has small shallow jar lids or pill container lids attached to the roof of the Bluebird houses and puts out meal worms for them when she is checking the houses during nesting season. It's amazing how they have learned to come for those tasty worms. I think feeding them makes a difference in the nestlings survival,esp. in the early part of May when the weather can often turn wet and cold. that is when we lose the young, they get wet and cold and the parents are not able to catch enough insects to feed themselves and their young. As for what they turn into in their later life cycle, the ones I had always turned into Beetles.
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