A tradie who is regularly hired to help homeowners deal with pesky invaders causing destruction inside their roofs has issued a warning to Aussies amid an increase in incidents. "You can have a possum on your roof for 10 years and have zero damage. But, if they crawl into the walls and start playing around between wires, that's a whole different issue," he told Yahoo News. Source: SuppliedPossum infestations are most common in Australian cities where increased urbanisation has drastically reduced possum habitat. Advertisement AdvertisementAdvertisement AdvertisementAirtasker has seen a 15 per cent increase in demand for help with possum infestations in the last year.