Hi Tommy This is a very common situation. I'd guess that 15% of bat infestations are found by real estate inspections. You need to get a professional bat removal and exclusion company out to the house
You are seeing larvae of the beetle known generically as carpet beetle. You may have been seeing small oval shaped beetles on your window sills from time to time, where they have been attracted to the
If you are seeing them on the walls there's an infestation nearby. Could be something as simple as spilled pet food, stored food products of some kind, or even some natural fabrics such as wool. The best
Dear Jane - I too will be most interested in learning what hatches out, as these certainly do not sound like the eggs of anything likely to be pest/parasite of pets or humans. Please take some clear photographs
John, "Fruit flies", or vinegar flies, don't nest per se but rather develop in some kind of rotting vegetable matter. It could be anything from a stash of apples that have gone bad to a nearby compost

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