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When renovating, you can make a few mistakes. You can even let animals in unintentionally. They make themselves comfortable and can destroy everything! We found a house where several openings were not closed. Not only did mice get in. The house also provided shelter for larger animals. Martens and large birds had an easy time of it. In the roof, they damaged the underlayment and the insulation. We found nests in the insulation. There was a lot of droppings and animal carcasses in the attic. Some martens had fed here. Remains of ducks were found here. Pigeons have nested in other houses. They then take the whole family. Within days, you have your own pigeon coop in the attic!