I just went to change the mealworms’ water, and all of the adult beetles have escaped! I don’t know how that happened – the lid was balanced on top with a gap around the top for air. I wonder if the new tub is made of a different material that they can climb up.
Looking on the bright side, at least they produced offspring before escaping. I will probably raise all of the larvae to adulthood in this batch so that I can produce a good breeding colony, and then start feeding the next generation to the chickens. Now I need to make a better tank for the adults…